Answer:
x= 7.5 mile/h
y= 3.5 miles / h
Step-by-step explanation:
Given x and y
so, x+y = speed down river
and x-y= speed up river
using
travel time = distance / speed for each case;
we get;
22/x+y=2 ---(1)
and
22/x-y=5.5 -----(2)
Solving equations simultaneously
eq 1 gives
2x+2y=22 ---(3)
eq 2 gives
5.5x-5.5y=22 ----(4)
Multiply eq 3 by 2.75
==> 5.5x+5.5y=60.5 --- (5)
adding eq 4 with eq 5
==> 11x =82.5
==> x= 7.5 miles/h
put this value in eq 3
==> 2(7.5)+2y=22
==> 2y=22-19.8
==> 2y=7
==> y = 3.5
Once setting up two equations based on downstream and upstream velocities, using variables x for Pratap's rowing speed and y for the current's speed, you can solve for these variables. The results show Pratap can row at a speed of 7.5 mph in still water, while the rate of the current is 3.5 mph.
Explanation:Firstly, we have to understand that Pratap's speed with the current and against the current will be affected. Let's say x is the speed of Pratap rowing in still water, and y is the speed of the current. When going downstream (in the direction of the current), Pratap's speed is (x + y) since the current helps him. He covered a distance of 22 miles in 2 hours, so the rate (velocity) can be found by dividing distance by time. Hence, x + y = 22/2 = 11 miles per hour.
On the other hand, when rowing upstream (against the current), Pratap's speed is (x - y), because now the current hinders his rate. He covered the same distance in 5 1/2 hours, so x - y = 22/(5.5) = 4 miles per hour.
Now, we have two equations: x + y = 11 and x - y = 4. Solving these equations (by adding them), we find that 2x = 15 hence x = 7.5. Pratap can row in still water at a speed of 7.5 miles per hour. Substituting x=7.5 into either of the original equations we get y = 3.5. Hence, the rate of the current is 3.5 miles per hour.
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NB HG thje triangle proportionality theorem was used to create a proportion. what is the value of x?
Answer:
x=16
Step-by-step explanation:
Since triangle DGH is parallel to trianle DBN, the corresponding sides are also proportional.
We have [tex]\frac{DN}{DH}=\frac{DB}{DG}[/tex]
This implies that:
[tex]\frac{40}{40+x}=\frac{30}{42}[/tex]
We cross multiply to get;
[tex]30(40+x)=42*40[/tex]
This implies that:
[tex](x+40)=14*4[/tex]
[tex]x+40=56[/tex]
[tex]x=56-40[/tex]
[tex]x=16[/tex]
f(x) = -16x2- 4x+ 382 find x
Answer:
calculator that what I got 56
Step-by-step explanation:
Nik, a social worker for a county, helps county residents who are struggling with different issues. Nik logs the following hours meeting with clients (c) or doing other work (o):_______
Mon: 6 c, 4 o
Tue: 8 c, 2 o
Wed: 9 c, 1 o
Thu: 7 c, 3 o
Fri: Off
What percent of time did Nik spend with clients on Thursday?
a. 10%
b. 70%
c. 30 %
d. 80%
Answer: b. 70%
Step-by-step explanation:
Given : Nik logs the following hours meeting with clients (c) or doing other work (o) :
Mon: 6 c, 4 o
Tue: 8 c, 2 o
Wed: 9 c, 1 o
Thu: 7 c, 3 o
Fri: Off
The number of hours Nik spend with clients on Thursday = 7 [Number of corresponding to c is 7 in the table]
Total hours he spend in work on Thursday = 7+3 = 10
The percent of time Nik spent with clients on Thursday :
[tex]\dfrac{\text{Number of hours he spent with clients}}{\text{Total works he work on Thursday}}\times100\\\\=\dfrac{7}{10}\times100=7\times10\%=70\%[/tex]
Hence, the Nik spent 70% of his time with clients on Thursday.
Thus , the correct option is b. 70%.
A submarine was descending at a rate of 300 feet per minute. If 0 represents sea level and distances below sea level are negative, which expression represents the location of the submarine after 4.5 minutes?
25 points
Answer:
The submarine will be located 1350ft below sea level or (-1350ft)
Step-by-step explanation:
First we must find the distance traveled
[tex](\frac{300}{1} )(\frac{4.5}{1})[/tex]
From this, we are able to calculate that traveled distance of the submarine.
300 x 4.5 = 1350
1350 + 0 (sea level) = 1350
Therefore the distance traveled by the submarine is 1350ft
Answer:
-1350 ft
Step-by-step explanation:
The formula to convert degrees Celsius to degrees Fahrenheit is 9/5 C + 32 equals F use this equation to find the Celsius equivalent of 86 degrees Fahrenheit
Answer:
86 °F = 30 °C
Step-by-step explanation:
Put the given number in the equation and solve for C.
86 = 9/5C +32
54 = 9/5C
(5/9)54 = C = 30
The equivalent is 30 degrees Celsius.
Final answer:
To convert 86 degrees Fahrenheit to Celsius, use the formula T°C = 5/9 (86 - 32). Subtracting 32 from 86 and then multiplying by 5/9 gives a result of 30 degrees Celsius.
Explanation:
The question asks how to find the Celsius equivalent of 86 degrees Fahrenheit using the formula to convert degrees Fahrenheit to degrees Celsius. The formula is T°C = 5/9 (T°F - 32), where T°C is the temperature in degrees Celsius and T°F is the temperature in degrees Fahrenheit.
To convert 86°F to Celsius, substitute 86 for T°F in the formula:
T°C = 5/9 (86 - 32)
First, subtract 32 from 86, which gives 54. Then, multiply 54 by 5/9 to get the final result:
T°C = 5/9 × 54
T°C = 30
Therefore, 86 degrees Fahrenheit is equivalent to 30 degrees Celsius.
When 5655 is divided by a positive two digit intreger "N" the remainder is 11, when 5879 is divided by the same intreger N the remainder is 11.
What is the sum of the digits of N ?
Answer:
8
Step-by-step explanation:
Hi,
When we divide 5655 by N, we get remainder of 11, which means that 5655-11 is a multiple of N.
5655 - 11 = 5644 is a multiple of N.
Similarly, 5879-14 should be a multiple of N.
5879 - 14 = 5865 is a multiple of N.
Because 5644 and 5865 are both multiples of N, their difference must be a multiple of N.
5865 − 5644 = 221 then 221 is a multiple of N.
We have three number of which N can be a multiple of, however we choose to factorize the smallest possible number amongst these three, which is 221. (This is only for simplification of the solution, smaller the number, less the factors)
221 : 1, 13, 17, 221.
There are only two two - digit factors: 13 and 17.
We divide 5865 and 5644 by both numbers.
[tex]\frac{5865}{13} = 451.15 \\\frac{5865}{17} = 345 \\\frac{5644}{13} = 434.15 \\\frac{5644}{17} = 332\\[/tex]
Looking at these results, we know only 17 divides all three numbers.
Hence N=17.
The sum of both digits will be: 1 + 7 = 8
Subtract the two given numbers excluding their identical remainders to find a multiple of the divisor N. By then finding a two-digit factor of this multiple that can divide both numbers, we get N = 28. The sum of its digits is 10.
Explanation:When a number is divided by a divisor and leaves the same remainder, the difference between these numbers is a multiple of that divisor. Therefore, as given, when 5655 is divided by a positive two-digit integer N, the remainder is 11, and also when 5879 is divided by N, the remainder is 11. To find N, we subtract the two numbers before considering the remainder, which will give us a number that is a multiple of N: 5879 - 5655 = 224.
So, N divides 224 perfectly. The factors of 224 that are two-digit numbers are 14, 16, and 28. However, since the remainder when dividing both 5655 and 5879 by N is identical and equal to 11, we need to make sure that both 5655-11 and 5879-11 are divisible by N equally, thus 5644 and 5868 should be divisible by N. The correct N which fulfills this condition is 28.
The sum of the digits of N or 28 is: 2 + 8 = 10.
To estimate the height of a building, a stone is dropped from the top of the building into a pool of water at ground level. The splash is seen 5.6 seconds after the stone is dropped. What is the height of the building? Use the position function s(t) = 4.9t² + v_0 t + s_0 for free falling objects.
Answer:
The height of the building is 153.664 meter.
Step-by-step explanation:
Consider the provided function.
[tex]s(t) = 4.9t^2 + v_0 t + s_0[/tex]
Here t represents the time v₀ represents the initial velocity, s₀ represents the initial height and s(t) represents the height after t seconds.
It is given that the splash is seen 5.6 seconds after the stone is dropped.
That means after 5.6 seconds height s(t) = 0, Also the initial velocity of the stone is 0.
Substitute respective values in the above function.
[tex]0 = 4.9(5.6)^2 +5.6(0)+ s_0[/tex]
[tex]0 = 4.9(31.36)+ s_0[/tex]
[tex]s_0=-153.664[/tex]
As height can't be a negative number so the value of s₀ is 153.664.
Hence, the height of the building is 153.664 meter.
Energy drink consumption has continued to gain in popularity since the 1997 debut of Red Bull, the current leader in the energy drink market. Given below are the exam scores and the number of 12-ounce energy drinks consumed within a week prior to the exam of 10 college students.Exam Scores - 75 - 92 - 84 - 64 - 64 - 86 - 81 - 61 - 73 - 93Number of Drinks - 5 - 3 - 2 - 4 - 2 - 7 - 3 - 0 - 1 - 01. Referring to Problem Statement 7, what is the sample covariance between the exam scores and the number of energy drinks consumed?2. Referring to Problem Statement 7, what is the sample correlation coefficient between the exam scores and the number of energy drinks consumed?
Answer:
1. 3.767
2. 0.145
Step-by-step explanation:
Let X be the exam scores and Y be the number of drinks.
X Y X-Xbar Y-Ybar (X-Xbar)(Y-Ybar) (X-Xbar)² (Y-Ybar)²
75 5 -2.3 2.3 -5.29 5.29 5.29
92 3 14.7 0.3 4.41 216.09 0.09
84 2 6.7 -0.7 -4.69 44.89 0.49
64 4 -13.3 1.3 -17.29 176.89 1.69
64 2 -13.3 -0.7 9.31 176.89 0.49
86 7 8.7 4.3 37.41 75.69 18.49
81 3 3.7 0.3 1.11 13.69 0.09
61 0 -16.3 -2.7 44.01 265.69 7.29
73 1 -4.3 -1.7 7.31 18.49 2.89
93 0 15.7 -2.7 -42.39 246.49 7.29
sumx=773, sumy=27, sum(x-xbar)(y-ybar)= 33.9 , sum(X-Xbar)²= 1240.1 ,sum(Y-Ybar)²= 44.1
Xbar=sumx/n=773/10=77.3
Ybar=sumy/n=27/10=2.7
1.
[tex]Cov(x,y)=sxy=\frac{Sum(X-Xbar)(Y-Ybar)}{n-1}[/tex]
Cov(x,y)=33.9/9
Cov(x,y)=3.76667
The the sample co-variance between the exam scores and the number of energy drinks consumed is 3.767
2.
[tex]Cor(x,y)=r=\frac{Sum(X-Xbar)(Y-Ybar)}{\sqrt{Sum(X-Xbar)^2sum(Y-Ybar)^2} }[/tex]
[tex]Cor(x,y)=r=\frac{33.9}{\sqrt{(1240.1)(44.1)} }[/tex]
Cor(x,y)=r=33.9/233.85553
Cor(x,y)=r=0.14496
The sample correlation coefficient between the exam scores and the number of energy drinks consumed 0.145.
Calculate sample covariance and correlation coefficient between exam scores and energy drinks consumed by students.
Explanation:Sample Covariance:
1. Calculate the mean of exam scores (77.3) and number of drinks (2.7).
2. Subtract the mean from each score and drink value to get the deviations.
3. Multiply the deviations of exam scores and drinks for each student, sum them up, and divide by 10 to get the sample covariance of approximately -22.6.
Sample Correlation Coefficient:
1. Calculate the standard deviations of exam scores (12.15) and number of drinks (2.51).
2. Divide the sample covariance by the product of the standard deviations to get the correlation coefficient of around -0.79.
Combine the like terms to create an equivalent expression:
2s+(−4s)=?
Combining 2s and −4s gives an equivalent expression of −2s.
We need to combine the like terms. Like terms are terms that have the same variable raised to the same power. In this case, both terms involve the variable "s."
In the expression 2s + (−4s), both terms are like terms because they both contain the variable "s." The coefficients are 2 and −4.
To combine like terms, you simply add or subtract their coefficients while keeping the variable the same:
Coefficient of the first term: 2
Coefficient of the second term: −4
Now, perform the arithmetic operation:
2 + (−4) = −2
Oliver makes blueberry jam every year the number of pints of jam he makes this can be represented by the expression 4p - 9= where p is the number of pints of jam he made last year oliver made 8 pints of jam.Last year how many pints dose he make this year
Answer: He makes 23 pints this year .
Step-by-step explanation:
Given : Oliver makes blueberry jam every year the number of pints of jam he makes this can be represented by the expression
[tex]4p - 9[/tex] , where p = the number of pints of jam he made last year.
if Oliver made 8 pints of jam last year , then p = 8
Substitute value p= 8 in the given expression , we get
Then, the number of pints he make this year = [tex]4(8)-9 = 32-9=23[/tex]
Hence, the number of pints Oliver make this year = 23
A function f(x) = 3^x is transformed into the function g(x) = 1/2 • 2^x+3 -5
Choose the transformations that occurred. CHOOSE ALL THAT APPLY.
-Vertical Shift Down
-Horizontal Shift Right
-X-axis Reflection
-Vertical Shift Up
-Vertical Compression
-Horizontal Shift Left
-Vertical Stretch
Answer:
Vertical compression, horizontal shift left, vertical shift down
Step-by-step explanation:
[tex]f(x) = 3^x => g(x) = \frac{1}{2} *2^{x+3} -5[/tex]
Let's break down what happened here:
[tex]\frac{1}{2}[/tex] - This indicates a vertical compression
[tex]2^{x+3}\\[/tex] - This indicates a horizontal shift left
-5 - This indicates a vertical shift down
Final answer:
Transforming f(x) to g(x) involves a vertical compression by ½, a horizontal shift left by 3 units, and a vertical shift down by 5 units. There is also an exponential base change, but it does not correspond directly to the given transformation options.
Explanation:
To transform the function f(x) = 3x into g(x) = ½ · 2x+3 - 5, let's analyze each part of the transformation. Break down g(x) into its components to determine the transformations:
The factor of ½ indicates a vertical compression by a factor of ½.The 2x+3 part involves an exponential base change and a horizontal shift. Since the function is initially 3x and we are transforming to 2x, there is a base change involved. To express 3 as a power of 2, we would get a vertical stretch (which is not the case here due to the mismatch in bases), so this part does not directly translate to one of the given transformations. Moreover, the addition of 3 inside the exponent of 2x+3 signifies a horizontal shift left by 3 units, not right as might be mistakenly assumed.The subtraction of 5 at the end of the function indicates a vertical shift downwards by 5 units.Based on this analysis, the correct transformations that occurred are a vertical compression, a horizontal shift left, and a vertical shift down.
HELP ONE MORE ANSWER PLEASEEEEE
Answer:
The length of the rope between the boat and the dock is of 30 feet.
Step-by-step explanation:
Given:
tan(40) ≈ 0.839
Angle of depression = 40 (deg)
Distance between boat and the floor of the ocean = 25.17 feet
If we look into the diagram we can see that,they form 2 right angled triangle.
Where we can say that :
Distance between boat and dock = Rope's distance = Base of the triangle.
Let the length of the rope be 'x' feet.
Considering the dotted triangle:
[tex]tan\ (40) =\frac{opposite}{adjacent}[/tex]
⇒ [tex]tan\ (40) =\frac{25.17}{x}[/tex]
⇒ [tex]tan\ (40)\times x =\frac{25.17}{x}\times x[/tex]
⇒ [tex]tan\ (40)\times x =25.17[/tex]
⇒ [tex]\frac{tan\ (40)\times x}{tan\ (40)} =\frac{25.17}{tan\ (40)}[/tex]
⇒ [tex]x =\frac{25.17}{0.839}[/tex]
⇒ [tex]x= 30[/tex]
Length of the rope between the boat and the dock is 'x' = 30 feet.
Bob and Meena play a two-person game which is won by the first person to accumulate at least 10 points. On each turn, there is a $\frac{2}{5}$ probability that Bob will get two points and Meena will lose one point. If that doesn't happen, then Meena gets two points and Bob loses a point. Meena is now ahead 9 to 6. What is the probability that Meena will win?
Answer:
The probability that Meena wins is 21/25
Step-by-step explanation:
In order for Meena to win, she needs to win the next turn or the following one, otherwise, she loses. The probability for that is equal to substract from 1 the probability of the complementary event: bob wins in the next 2 turns. Since each turn is independent from the other, we can obtain the probability of Bob winning the next 2 turns by taking the square of the probability of him winning on one turn, hence it is
[tex] {\frac{2}{5}}^2 = \frac{4}{25} [/tex]
Thus, the probability for Meena to win is 1-4/25 = 21/25.
Meena only needs one more point to win, and with a ⅘ or 60% probability in her favor for the next turn, she will win the game.
The question asks for the probability that Meena will win a game where she is currently ahead 9 to 6, and the game is won by the first person to reach 10 points. In each turn, there is a ⅗ chance that Bob will get 2 points and Meena will lose 1 point, and a ⅘ chance that Meena will get 2 points and Bob will lose 1 point.
To find the probability of Meena winning, we only need to look at the next round because Meena is already at 9 points and she needs only 1 point to win. Two scenarios can occur:
Bob gets 2 points, and Meena loses 1 point. This outcome is not possible because Meena cannot have 8 points; she's already at 9 points. So, this situation doesn't count.
Meena gets 2 points (which will put her at or above 10 points) and Bob loses 1 point. This is the winning scenario for Meena. The probability of this happening is ⅘ or 0.6 (since only this outcome will end the game with Meena as the winner).
Therefore, the probability that Meena will win on the next turn (and win the game) is 0.6 or 60%
A circle has a diameter with endpoints (-10, -6) and (-2, -4).
What is the equation of the circle?
r2 = (x + 4)2 + (y + 5)2
r2 = (x + 6)2 + (y + 5)2
r2 = (x + 4)2 + (y + 1)2
r2 = (x + 6)2 + (y - 1)2
Answer: [tex](x+6)^{2}+(y+5)^{2}=r^{2}[/tex]
Step-by-step explanation:
The formula for finding the equation of circle with center (a,b) is given as :
[tex](x-a)^{2}+(y-b)^{2}=r^{2}[/tex]
The end point of the diameter is given as :
(-10, -6) and (-2, -4) , this means that the coordinate of the center is the Mid -point of the end point .
The mid - point = ( -6 , - 5)
substituting into the formula , we have
[tex](x-(-6))^{2}+(y-(-5))^{2}[/tex][tex]= r^{2}[/tex]
[tex](x+6)^{2}+(y+5)^{2}=r^{2}[/tex]
This is the equation of the circle
While on vacation, Enzo sleeps 115\%115% as long as he does while school is in session. He sleeps an average of SS hours per day while he is on vacation
Answer: Let the Number of hours Enzo sleeps on average per day while School is in session be Y
Y = SS/115% = SS/1.15
Step-by-step explanation:
Given in the question:
- While on vacation, Enzo sleeps 115% as much as he sleeps when school is in session.
- Enzo sleeps SS hours per day during vacation
Mathematically, SS = 115% of Y
SS = 115% × Y
115% × Y = SS
Y = SS/115%
But 115% = 115/100 = 1.15
Therefore,
Y = SS/1.15
Solved!
HELP ASAP PLEASE!!!!!!!!!!!!
What is the measure of ∠CED and ∠ACD?
Answer:
[tex]\angle ACD=124\°\\\\\angle CED=64\°[/tex]
Step-by-step explanation:
To solve this exercise you need to remember:
1. The sum of the Interior angles of a triangle is 180 degrees.
2. Straight angles are those angles that measure 180 degrees.
3. Supplementary angles are those angles whose sum is 180 degrees.
4. Vertical angles are angles that share the same vertex and they are opposiste to each other. They are congruent.
Knowing the above, you can set up the following equation:
[tex]31\°+93\°+\angle ACB=180\°[/tex]
Solving the equation, you get:
[tex]\angle ACB=180\°-124\°=56\°[/tex]
Since [tex]\angle ACB[/tex] and [tex]\angle DCE[/tex] are Vertical angles:
[tex]\angle ACB=\angle DCE=56\°[/tex]
Knowing the measure of [tex]\angle DCE[/tex] , you can write the following equation to find [tex]\angle CED[/tex]:
[tex]56\°+60\°+\angle CED=180\°[/tex]
Solve the equation:
[tex]\angle CED=180\°-116\°=64\°[/tex]
As you can observe in the figure, the angles [tex]\angle DCE[/tex] and [tex]\angle ACD[/tex] are Supplementary. Then:
[tex]\angle ACD+\angle DCE=180\°\\\\\angle ACD+56\°=180\°[/tex]
Solving for [tex]\angle ACD[/tex], you get:
[tex]\angle ACD=180\°-56\°=124\°[/tex]
Triangle DEF has sides with lengths of 6, 11, and 13 units. Determine whether this triangle is a right triangle. Show all work necessary to justify your answer. A right triangle has a hypotenuse with a length of 25. The lengths of the legs are whole numbers. What could be possible lengths of the legs?
Answer:
Triangle DEF is not a right triangle ; possible lengths are 20 & 15
Step-by-step explanation:
For right triangle;
the sum of the square of the two adjacent sides must equal the square of the hypotenus.
Therefore, (6^2)+(11^2)≠(13^2).
the possible length are 20 & 15 because
(20^2)+(15^2)=(25^2)
Triangle DEF with sides lengths of 6, 11, and 13 units is not a right triangle as the Pythagorean theorem is not satisfied. To find the lengths of the legs of a right triangle with a hypotenuse of 25, one can use the Pythagorean theorem to find whole number pairs that satisfy the equation.
To determine whether triangle DEF is a right triangle with sides of lengths 6, 11, and 13 units, we can use the Pythagorean theorem. This theorem states that in a right triangle, the square of the length of the hypotenuse (c) is equal to the sum of the squares of the lengths of the other two sides (a and b): a² + b² = c².
Let's check if the sides of triangle DEF satisfy this condition:
a = 6, b = 11, and c = 13a² + b² = 6² + 11² = 36 + 121 = 157c² = 13² = 169Since 157 does not equal 169, triangle DEF is not a right triangle.
For the second part of the question, we are given that a right triangle has a hypotenuse with a length of 25 units and we need to find the lengths of the legs which are whole numbers. We can use the Pythagorean theorem to find pairs of integers (a and b) that satisfy the equation a² + b² = 25² = 625. Some possible pairs of legs that meet this criterion include (7, 24), (15, 20), and (9, 24). Note that there are multiple correct answers to this question.
Identify the equation of a line in slope- intercept form that is perpendicular to y = -1/3 x + 2 and passes through (2, 1) Show your work PLEASE!!
Answer: y = 3x - 5
Step-by-step explanation:
The equation of a straight line can be represented in the slope intercept form as
y = mx + c
Where
c = intercept
m = slope = (change in the value of y in the y axis) / (change in the value of x in the x axis)
The equation of the given line is
y = -1/3x + 2
Comparing with the slope intercept form, slope = - 1/3
If two lines are perpendicular, it means that the slope of one line is the negative reciprocal of the slope of the other line. Therefore, the slope of the line passing through
(2, 1) is 3/1 = 3
To determine the intercept, we would substitute m = 3, x = 2 and y = 1 into y = mx + c. It becomes
1 = 3 × 2 + c = 6 + c
c = 1 - 6 = - 5
The equation becomes
y = 3x - 5
Reggie is going to make a scale model of a tyrannosaurus rex dinosaur. Tyrannosaurus was 20 ft high, if you use a scale of 2. : 5ft how tall will the model be?
A. 10in
B. 6in
C. 4in
D. 8in
Answer:
D) 8 inches
Step-by-step explanation:
Since the ratio is 2:60 inches, therefore the model should be:
2/60 X 240=8 inches tall, or 8/12=2/3 foot tall.
Zoey wants to use her iPad throughout a 6-hour flight. Upon takeoff, she uses the iPad for 2 hours and notices that the battery dropped by 25%, from 100% to 75%. How many total hours can Zoey expect from the iPad on a full battery charge?
a. 10 hours
b. 4 hours
c. 8 hours
d. 6 hours
Answer:
The answer is c. 8 hours
Step-by-step explanation:
Since her battery dropped 25% in 2 hours then for it to drop 100% would take 8 hours.
25%+25%+25%+25%= 100%
so with this logic
25%= 2 hours
2+2+2+2=8
Hoped this helped !
Cheers, Z
Zoey can expect 8 hours of use from her iPad on a full battery charge (c).
Explanation:To find the total hours Zoey can expect from her iPad on a full battery charge, we need to determine how many hours the battery percentage dropped for each hour of use.
If the battery dropped by 25% in 2 hours, that means it dropped by 12.5% (25% divided by 2) per hour.
To find the total hours, we divide 100% (full battery charge) by the percentage dropped per hour. In this case, 100% divided by 12.5% equals 8 hours.
Therefore, Zoey can expect 8 hours(c) of use from her iPad on a full battery charge.
Learn more about iPad battery life here:https://brainly.com/question/35390557
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A tank contains 90 kg of salt and 1000 L of water. A solution of a concentration 0.045 kg of salt per liter enters a tank at the rate 8 L/min. The solution is mixed and drains from the tank at the same rate.a) What is the concentration of the solution in the tank initially?
b) Find the amount of salt in the tank after 4 hours.
c) Find the concentration of salt in the solution in the tank as time approaches infinity.
Answer:
Step-by-step explanation:
concentration = amount of salt/solution
A) Initial concentration= 90/1000 = 0.09
Q = quantity of salt
Q(0) = 90 kg
Inflow rate = 8 l/min
Outflow rate = 8 l/min
Solution = 1000 L at any time t.
Salt inflow = 0.045 * 8 per minute
= 0.36 kg per minute
This is mixed and drains from the tank.
Outflow = [tex]\frac{Q(t)}{1000}[/tex]
Thus rate of change of salt
Q'(t) = inflow - outflow = [tex]0.36-\frac{Q(t)}{1000} \\=\frac{360-Q(t)}{1000}[/tex]
Separate the variables and integrate
[tex]\frac{1000dQ}{360-q(t)} =dt\\-1000 ln |360-Q(t)| = t+C\\ln |360-Q(t)| = -0.001+C'\\360-Q(t) = Ae^{-0.001t} \\Q(t) = 360-Ae^{-0.001t}[/tex]
Use the fact that Q(0) = 90
90 = 360-A
A = 270
So
[tex]Q(t) = 360-270e^{-0.001t}[/tex]
B) Q(t) = 360-270e^-0.004 = 91.07784
C) When t approaches infinity, we get
Q(t) tends to 360
So concentration =360/1000 = 0.36
Final answer:
a) The initial concentration of the solution in the tank is 0.09 kg/L. b) The amount of salt in the tank after 4 hours is 3.6 kg. c) The concentration of salt in the solution in the tank approaches 0.045 kg/L as time approaches infinity.
Explanation:
a) To find the concentration of the solution in the tank initially, we need to calculate the total mass of salt and water in the tank. The concentration is the mass of salt divided by the volume of water. Since 1 liter of water weighs 1 kg, the initial concentration of the solution in the tank is 90 kg of salt divided by 1000 kg of water, which is 0.09 kg/L.
b) To find the amount of salt in the tank after 4 hours, we need to calculate the amount of salt entering the tank and the amount of salt leaving the tank in that time. The amount of salt entering the tank is the concentration of the incoming solution (0.045 kg/L) multiplied by the rate of flow (8 L/min) and the time (4 hours = 240 minutes). This gives us 0.045 kg/L × 8 L/min × 240 min = 86.4 kg. The amount of salt leaving the tank is the concentration of the solution in the tank (0.09 kg/L) multiplied by the rate of flow (8 L/min) and the time (4 hours = 240 minutes). This gives us 0.09 kg/L × 8 L/min × 240 min = 172.8 kg. Therefore, the amount of salt in the tank after 4 hours is the initial amount of salt (90 kg) plus the amount of salt entering the tank (86.4 kg) minus the amount of salt leaving the tank (172.8 kg), which is 3.6 kg.
c) As time approaches infinity, the concentration of salt in the solution in the tank will approach the concentration of the incoming solution, which is 0.045 kg/L.
A market analyst has projected that the cost of producing d dog leashes will be given by the polynomial 9000 + 3.2d. The revenue generated from the sale of d dog leashes will be given by the polynomial d(15 - 0.00005d). Which polynomial expression represents the profit earned from producing, and selling d dog leashes?
A. - 0.0016d³ + 47.55d² + 135,000d
B. 0.00005d² - 18.2d - 9000
C. - 0.00005d² + 11.8d - 9000
D. - 0.00005d² - 11.8d + 9000
Answer:
C. [tex]-0.00005d^2+11.8d-9000[/tex]
Step-by-step explanation:
Given:
Cost Price for producing 'd' dog lashes = [tex]9000+3.2d[/tex]
Revenue Generated from selling 'd' dog lashes = [tex]d(15-0.00005d)[/tex]
We need to find the profit earned from producing and selling 'd' dog lashes.
Solution:
Now we know that;
profit earned from producing and selling 'd' dog lashes can be calculated by Subtracting Cost Price for producing 'd' dog lashes from Revenue Generated from selling 'd' dog lashes.
framing in equation form we get;
Profit earned = [tex]d(15-0.00005d)-(9000+3.2d)[/tex]
Now Applying Distributive property we get;
Profit earned = [tex]15d-0.00005d^2-9000-3.2d[/tex]
Now Combining like terms we get;
Profit earned = [tex]-0.00005d^2+15d-3.2d-9000[/tex]
Profit earned = [tex]-0.00005d^2+11.8d-9000[/tex]
Hence Profit earned from producing and selling 'd' dog lashes is [tex]-0.00005d^2+11.8d-9000[/tex].
Final answer:
The polynomial representing the profit from producing and selling d dog leashes is -0.00005d² + 11.8d - 9000, calculated by subtracting the cost (9000 + 3.2d) from the revenue (d(15 - 0.00005d)).
Explanation:
The student's question relates to finding the polynomial expression that represents the profit earned from producing and selling d dog leashes. Profit is calculated by subtracting the cost from the revenue. The cost polynomial is given as 9000 + 3.2d, and the revenue polynomial is d(15 - 0.00005d).
To find the profit, we subtract the cost from the revenue:
Profit = Revenue - Cost
Profit = (d(15 - 0.00005d)) - (9000 + 3.2d)
Profit = 15d - 0.00005d² - 9000 - 3.2d
Profit = -0.00005d² + (15 - 3.2)d - 9000
Profit = -0.00005d² + 11.8d - 9000
Therefore, the correct polynomial that represents the profit is -0.00005d² + 11.8d - 9000.
When an object is droppednbsp on a certain earth dash like planet comma on a certain earth-like planet, the distance it falls in t seconds, assuming that air resistance is negligible, is given by s(t)equals=1818t2 where s(t) is in feet. Suppose that a medic's reflex hammer is dropped from a hovering helicopter. Find(a) how far the hammer falls in 44 sec, (b) how fast the hammer is traveling 44 sec after being dropped, and (c) the hammer's acceleration after it has been falling for 44 sec.
Final answer:
To solve for the distance, velocity, and acceleration of a hammer dropped from a hovering helicopter, calculations based on the given formula s(t) = 1818t^2 are used, yielding a fall of 29128 feet in 4 seconds, a velocity of 14512 feet/sec at 4 seconds, and a constant acceleration of 3636 feet/sec^2.
Explanation:
When an object is dropped on a certain earth-like planet, the distance it falls in t seconds, assuming that air resistance is negligible, is given by s(t) = 1818t2, where s(t) is in feet. To solve the problem involving a medic's reflex hammer dropped from a hovering helicopter:
(a) To find how far the hammer falls in 4 seconds, substitute t = 4 into the equation: s(4) = 1818(4)2 = 29128 feet.
(b) The velocity of the hammer after 4 seconds can be found using the derivative of s(t), v(t) = 2×1818×t. Substituting t = 4, v(4) = 2×1818×4 = 14512 feet/sec.
(c) The acceleration of the hammer is constant and equal to 2×1818 feet/sec2 = 3636 feet/sec2, which is twice the coefficient in the equation for s(t).
These calculations demonstrate the principles of kinematics, specifically how position, velocity, and acceleration relate to one another for an object in free fall on an earth-like planet with negligible air resistance.
You are dealt 13 cards from a shuffled deck of 52 cards. Compute the probability that (a) your hand lacks at least one suit, (b) you get the both Ace and King of at least one suit, (c) you get all four cards of at least one denomination (all Aces, or all Kings, or all Queens, . . . , or all Twos).
Answer:
Attached is the image of the solution . cheers
Which is the equation of a parabola with a directrix at y = −3 and a focus at (5, 3)? y = one twelfth(x − 5)2 y = −one twelfth(x − 5)2 y = one twelfth(x + 5)2 y = −one twelfth(x + 5)2
Answer:
The answer to your question is y = 1/12 (x - 5)²
Step-by-step explanation:
Data
directrix y = -3
focus (5, 3)
Process
1.- Graph the directrix and focus to determine if the parabola is vertical or horizontal.
From the graph we know that it is a vertical parabola with equation
(x - h)² = 4p(y - k)
2.- From the graph we know that p = 3 because the distance from the focus to the directrix is 6 and p = 6/2.
3.- The vertex (5, 0)
4.- Substitution
(x - 5)² = 4(3)(y - 0)
5.- Simplification
(x - 5)² = 12y
6.- Result
y = 1/12 (x - 5)²
Answer:
y = 1/12 (x - 5)²
Step-by-step explanation:
Need help doing this, show steps if you could.
Answer:
option 1
Step-by-step explanation:
first we have to find the slopes of the lines
D(1, -2) E(3, 4)
y = m*x + b
m1: slope
m1 = (y2-y1) / (x2-x1)
m1 = (4 - (-2)) / (3 - 1)
m1 = 4+2 / 3-1
m1 = 6 / 2
m1 = 3
we do the same with the other 2 points
D(-1, 2) E(4, 0)
y = m*x + b
m2: slope
m2 = (y2-y1) / (x2-x1)
m2 = (0 - 2) / (4 - (-1))
m2 = -2 / 4 + 1
m2 = -2 / 5
m1 = 3 m2 = -2/5
for 2 lines to be perpendicular it must be met
m1 * m2 = -1
we check if they are perpendicular
3 * -2/5 = -1
-6/5 = -1 <-- no perpendicular
Hilton Hotels wishes to conduct a study on the determinants of brand loyalty among Hilton Hotel customers. The Hilton organization estimates that 10% of its 2,600,000 Hilton Honors club members are loyal to the Hilton brand wherever they travel. However, the remaining members may choose other hotel brands at times. The organization wants to understand how to increase loyalty among the other 90% of club members.
Answer:
Sampling Frame
Step-by-step explanation:
If you are finding the representation of this style than it isHilton Honors membership list represents the Sampling frame
Isosceles triangle $ABE$ of area 100 square inches is cut by $\overline{CD}$ into an isosceles trapezoid and a smaller isosceles triangle. The area of the trapezoid is 75 square inches. If the altitude of triangle $ABE$ from $A$ is 20 inches, what is the number of inches in the length of $\overline{CD}$ ?
Answer:
5 inches
Step-by-step explanation:
See attachment for explanation.
solve the question by completing the sqaure x² + 4x = 0?
Answer:
x = 0 or -4
Step-by-step explanation:
x² + 4x = 0
To complete the square, take half of the middle coefficient, square it, then add to both sides.
(4/2)² = 2² = 4
x² + 4x + 4 = 4
(x + 2)² = 4
x + 2 = ±2
x = -2 ± 2
x = 0 or -4
Write the slope-intercept form (y=mx+b) of the equation of the line given the slope and y-intercept.
Answer:
A
Step-by-step explanation:
y = mx + c
y = -½x + 1