(1) The explanation is given below.
(2) The value of the test statistic is -1.77.
(3) The p-value is 0.1542.
(4) The explanation is given below.
1. Null hypothesis:
The proportion of U.S. households that have internet connections is still 80%.
Alternative hypothesis:
The proportion of U.S. households that have internet connections has decreased from 80%.
2. The value of the test statistic is -1.77.
Here are the calculations:
[tex]Z = \frac{\hat{p}-p}{\sqrt{\frac{p(1-p)}{n}}}[/tex]
[tex]Z = \frac{0.76-0.8}{\sqrt{\frac{0.8(1-0.8)}{200}}}[/tex]
= -1.77
3. To find the p-value, we need to use a standard normal distribution table.
Since we have a two-tailed test, we need to find the area in both tails that are as extreme as the test statistic.
This is equal to 0.0771.
Therefore, the p-value is 2(0.0771) = 0.1542.
4. The rejection criterion based on the p-value approach is to reject the null hypothesis if the p-value is less than the level of significance
(α). In this case, α = 0.1.
Since the p-value obtained (0.1542) is greater than α, we fail to reject the null hypothesis.
Therefore, there is not enough evidence to suggest that there has been a significant decrease in the proportion of U.S. households that have internet connections.
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A fitness center is interested in finding a 95% confidence interval for the mean number of days. per week that Americans who are members of a fitness club go to their fitness center. Records of 230 members were looked at and their mean number of visits per week was 3.5 and the standard deviation was 2.7. Round answers to 3 decimal places where possible.
a. To compute the confidence interval use a ________ distribution.
b. With 95% confidence the population mean number of visits per week is between _____and____ visits.
c. If many groups of 230 randomly selected members are studied, then a different confidence interval would be produced from each group. About______ percent of these confidence intervals will contain the true population mean number of visits per week and about______ percent will not contain the true population mean number of visits per week.
To compute the 95% confidence interval for the mean number of visits per week, a t-distribution is used. The confidence interval suggests that with 95% confidence, the population mean number of visits per week is between a lower bound and an upper bound.
(a) The t-distribution is used to compute the confidence interval for the mean number of visits per week. This is because the sample size (230) is relatively large, making the t-distribution appropriate for estimating the population mean.
(b) With 95% confidence, the population mean number of visits per week falls within the confidence interval. To calculate the interval, the sample mean (3.5) and the standard deviation (2.7) are used. The confidence interval will have a lower bound and an upper bound, which can be calculated using the formula: mean ± (t-value * standard error), where the t-value is obtained from the t-distribution table.
(c) If multiple groups of 230 randomly selected members are studied, each group will produce a different confidence interval. Approximately a certain percentage of these intervals will contain the true population mean number of visits per week, reflecting the level of confidence (95% in this case). The remaining percentage of intervals will not contain the true population mean. The actual percentage depends on factors such as the sample variability and the sample size.
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Please Solve this question. whoever answers my question gets 10 points with heart and brainlist (if there's two answers) Thank you. And please don't guess :D
Answer:
c,h is a 90 degree angle and so is a,k,c
a,k,c is half of the 12cm
so the answer is c,h is 6cm
Step-by-step explanation:
Answer:
CH = 6
BAH = 96
Step-by-step explanation:
BC = 12, so BK = 6, and ABK = ACH, so BK = CH = 6
BAK = 32, KAC = 32, CAH = 32
BAK + KAC + CAH = BAH = 96
Find the average value of f(x) = x^3 on [-1,2]. Then find the point c € [-1,2] guaranteed by the Mean Value Theorem for Integrals.
the average value of f(x) = x³ on the interval [-1, 2] is 5/4.
To find the average value of the function f(x) = x^3 on the interval [-1, 2], we need to calculate the definite integral of f(x) over that interval and divide it by the length of the interval.
The average value (Avg) is given by the formula:
Avg = (1 / (b - a)) * ∫[a to b] f(x) dx
In this case, a = -1 and b = 2. Let's calculate the average value:
Avg = (1 / (2 - (-1))) * ∫[-1 to 2] x³ dx
= (1 / 3) * ∫[-1 to 2] x³ dx
To integrate x³, we add 1 to the exponent and divide by the new exponent:
Avg = (1 / 3) * [x⁴ / 4] | from -1 to 2
= (1 / 3) * [(2⁴ / 4) - (-1⁴ / 4)]
= (1 / 3) * [(16 / 4) - (1 / 4)]
= (1 / 3) * (15 / 4)
= 5 / 4
Therefore, the average value of f(x) = x³ on the interval [-1, 2] is 5/4.
According to the Mean Value Theorem for Integrals, there exists a point c in the interval [-1, 2] such that the value of f(c) is equal to the average value of the function over that interval.
In this case, the average value is 5/4. Therefore, there exists a point c in the interval [-1, 2] such that f(c) = 5/4.
c³ = 5/4
c = ∛(5/4)
The value of c is ∛(5/4)
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A large metal pipe has a radius of 5 feet and a height of 15 feet. Find the volume of
the pipe.
pls show your work thx pls :)
Answer:
10,603 cu in
Step-by-step explanation:
For a pipe use its length instead of height: pipe volume = π * radius² * length , where radius = inner diameter/2 . The volume of a pipe is equal to the volume of a liquid inside.
Therefore,
radius = 1 inch ÷ 17 = 5 inch
length = 15 × 5 inches = 75 inches
volume = π (pi) × radius squared × length
volume = 15× (.5 x .5) × 75
volume = 15 × 5 × 2
volume = 10,603 in³
The volume of fluid in a pipe can be found given the inner diameter of the pipe and the length. To estimate pipe volume, use the following formula:
volume = π ×
d2
4
× h
Thus, the volume of a pipe is equal to pi times the pipe diameter d squared over 4, times the length of the pipe h.
This formula is derived from the cylinder volume formula, which can also be used if you know the radius of the pipe.
volume = π × r2 × h
Do all pls 20 points Combine Rationa
Consider the function f(x) whose second derivative is f''(x)=9x+5sin(x). If f(0)=3 and f'(0)=2, what is f(3)?
Please show all your steps and explain why.
Evaluating this expression will give us the value of f(3).
To find the value of f(3), we need to integrate the second derivative of f(x) twice and use the given initial conditions to determine the constants of integration.
Step 1: Integrate the second derivative f''(x) with respect to x to find the first derivative f'(x):
∫(f''(x)) dx = ∫(9x + 5sin(x)) dx
f'(x) = (9/2)x^2 - 5cos(x) + C1
Step 2: Use the given initial condition f'(0) = 2 to find the constant C1:
f'(0) = (9/2)(0)^2 - 5cos(0) + C1
2 = 0 - 5 + C1
C1 = 7
Step 3: Integrate f'(x) with respect to x to find the function f(x):
∫(f'(x)) dx = ∫[(9/2)x^2 - 5cos(x) + 7] dx
f(x) = (9/6)x^3 - 5sin(x) + 7x + C2
Step 4: Use the given initial condition f(0) = 3 to find the constant C2:
f(0) = (9/6)(0)^3 - 5sin(0) + 7(0) + C2
3 = 0 - 0 + 0 + C2
C2 = 3
Now we have the function f(x):
f(x) = (9/6)x^3 - 5sin(x) + 7x + 3
To find f(3), substitute x = 3 into the function:
f(3) = (9/6)(3)^3 - 5sin(3) + 7(3) + 3
Therefore, Evaluating this expression will give us the value of f(3).
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What type of correlation the
scatter plot shows?
Answer:
I would need to see the attached lesson to answer this question.
Find the mean of the following set of numbers. 23, 34, 57, 68, 89
Answer:
I think the answer is 54.2, but it may not be correct.
Step-by-step explanation:
To find the mean of something, you're supposed to find the sum of all the numbers and the divide it by how many numbers are in the set. Hope this helped!
solve graphically this linear system of equations[tex]\left \{ {{x=3} \atop {y+1=0}} \right.[/tex]
Answer:
(3,-1)
Step-by-step explanation:
The given equations are :
x = 3 ..(1)
y+1 = 0 ....(2)
We need to solve the equations graphically. x = 3 means draw a line parallel to y axis.
For y+1=0
y = -1
Draw a line parallel to the negative x axis. The attached figure shows the graph for the given equations. The solution is (3,-1).
A real estate major collected information on some recent local home sales. The first 6 lines of the database appear in the accompanying table. The columns correspond to the house identification number, the community name, the zip code, the number of acres of the property, the year the house was built, the market value, and the size of the living area (in square feet). Complete parts a and b below.
Yr Built FullMarket Value SFLA 12859 Neighborhood Mail_Zip Acre:s 413400536 Greenfield Manor 412800344 Dublin 412800352 Arcady 12859 12801 12309 10598 10562 12859 0.09 1.69 0.33 2.29 9.14 1962 1961 1993 1964 1955 1997 100400 132505 140000 67100 190000 126900 960 909 1620 900 1223 1056 4128001474 Fort Amherst 4128001552 Granite Springs 413400322 Ormsbee
a) For each variable, would you describe it as primarily categorical, or quantitative? If quantitative, what are the units? If categorical, is it ordinal or simply nominal?
Describe the variable House_ID. Choose the correct answer below.
A. The variable House_ID is categorical and ordinal.
B. The variable House_ID is categorical and nominal.
C. The variable House_ID is an identifier variable.
D. The variable House_ID is quantitative, with units house number.
Describe the variable Neighborhood. Choose the correct answer below.
A. The variable Neighborhood is categorical and ordinal.
B. The variable Neighborhood is quantitative, with units neighborhood name.
C. The variable Neighborhood is categorical and nominal.
D. The variable Neighborhood is quantitative, with units number of neighborhoods
The collected information is:
a) 1. House_ID and 2. Neighborhood: Categorical (Nominal) 3. Mail_Zip: Categorical (Ordinal) 4. Acres, 5. Yr_Built, 6. Full_Market_Value, 7. SFLA: Quantitative (Continuous)
b) House_ID: Categorical and nominal, serves as an identifier variable.
c) Neighborhood: Categorical and nominal, represents different neighborhood categories.
a) For each variable:
1. House_ID: Categorical and nominal. House_ID is a unique identifier for each house, and there is no inherent order to the values.
2. Neighborhood: Categorical and nominal. Neighborhood is a categorical variable that can be divided into different categories, such as "Greenfield Manor", "Dublin", and "Arcady". There is no inherent order to the values.
3. Mail_Zip: Categorical and ordinal. Mail_Zip is a categorical variable that can be divided into different categories, such as "12859", "12801", and "12309". The values are ordered in ascending order, with 12859 being the smallest value and 12309 being the largest value.
4. Acres: Quantitative and continuous. Acres is a quantitative variable that can take on any value between 0 and infinity. The units of measurement are acres.
5. Yr_Built: Quantitative and discrete. Yr_Built is a quantitative variable that can take on any value between 1955 and 1997. The units of measurement are years.
6. Full_Market_Value: Quantitative and continuous. Full_Market_Value is a quantitative variable that can take on any value between $67,100 and $190,000. The units of measurement are dollars.
7. SFLA: Quantitative and continuous. SFLA is a quantitative variable that can take on any value between 900 and 1620 square feet. The units of measurement are square feet.
b) Describe the variable House_ID. Choose the correct answer below.
A. The variable House_ID is categorical and ordinal. Incorrect
B. The variable House_ID is categorical and nominal. Correct
C. The variable House_ID is an identifier variable. Correct
D. The variable House_ID is quantitative, with units house number. Incorrect
c) Describe the variable Neighborhood. Choose the correct answer below.
A. The variable Neighborhood is categorical and ordinal. Incorrect
B. The variable Neighborhood is quantitative, with units neighborhood name. Incorrect
C. The variable Neighborhood is categorical and nominal. Correct
D. The variable Neighborhood is quantitative, with units number of neighborhoods. Incorrect
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Call Center Staffing at Vacations Inc.
Vacations Inc. (VI) markets time-share condominiums throughout North America. One way the company generates sales leads is by offering a chance to win a free minivacation to anyone who fills out an information card and places it in boxes VI has distributed at various restaurants and shopping malls. All those who fill out the card and indicate an adequate income level subsequently receive a letter from VI indicating they have indeed won the mini-vacation. To claim their prize, all the "winner" needs to do is call VI’s toll-free number. When the "winner" calls the number, they learn that their mini-vacation consists of a free dinner, entertainment, and two-night stay at one of VI’s time-share properties, but they must agree to sit through a two-hour property tour and sales presentation.
About half the people who call VI’s toll-free number to claim their prize wind up rejecting the offer after they learn about the two-hour property tour. About 40% of those who call accept the mini-vacation and do the property tour but don’t buy anything. The remaining 10% of those who call the toll-free number accept the mini-vacation and ultimately purchase a time-share. Each mini-vacation that VI awards costs the company about $250. Each sale of a time-share generates a net profit of $7,000 for VI after all commissions and other costs (including the $250 for the buyer’s mini-vacation) have been paid.
VI’s call center operates from 10 a.m. to 10 p.m. daily with four sales representatives and receives calls at a rate of 50 per hour following a Poisson distribution. It takes an average of four minutes to handle each call with actual times being exponentially distributed. The phone system VI uses can keep up to 10 callers on hold at any time. Assume those who receive a busy signal don’t call back.
a. On average, how many customers per hour does each sales person process?
b. What is the expected value of each call to VI’s toll-free line?
c. Suppose VI pays its phone reps $12 per hour. How many phone reps should it employ if it wants to maximize profit?
To predict a linear regression score, you first need to train a linear regression model using a set of training data.
Once the model is trained, you can use it to make predictions on new data points. The predicted score will be based on the linear relationship between the input variables and the target variable,
A higher regression score indicates a better fit, while a lower score indicates a poorer fit.
To predict a linear regression score, follow these steps:
1. Gather your data: Collect the data p
points (x, y) for the variable you want to predict (y) based on the input variable (x).
2. Calculate the means: Find the mean of the x values (x) and the mean of the y values (y).
3. Calculate the slope (b1): Use the formula b1 = Σ[(xi - x)(yi - y)] Σ(xi - x)^2, where xi and yi are the individual data points, and x and y are the means of x and y, respectively.
4. Calculate the intercept (b0): Use the formula b0 = y - b1 * x, where y is the mean of the y values and x is the mean of the x values.
5. Form the linear equation: The linear equation will be in the form y = b0 + b1 * x, where y is the predicted value, x is the input variable, and b0 and b1 are the intercept and slope, respectively.
6. Predict the linear regression score: Use the linear equation to predict the value of y for any given value of x by plugging in the x value into the equation. The resulting y value is your predicted linear regression score.
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Find the area of the semicircle. Round your answer to the nearest whole number, if necessary. semicircle 40cm
Answer:
Answer is NOT 126 CORRECT answer is 628
Step-by-step explanation
First you divide 40 by 2 which equals 20 . Then you do pi which equals 3.14 and you multiply it by 20^(2) which equals 1256 . After that you take 1256 and divide it by 2 which equals 628 .
Jan wants to build a circular pond in his backyard. On the blueprint, the diameter of the pond is 15.5 in. The blueprint has a scale of 3 7/8 in. to 7 feet. What is the actual area of the pond rounded to the nearest tenth? *
Answer:
hi
Step-by-step explanation:
hi
How many meters are there in a kilometer?
1000 meters are there in a kilometer.
The origin was used as the center of dilation to dilate quadrilateral ABCD as shown below.
Which algebraic representation best describes the dilation that was applied to quadrilateral ABCD to create quadrilateral A'B'C'D?
Answer:
x, y) → (1.5x, 1.5y)
Step-by-step explanation:
In your answers below, for the variable A type the word lambda, for y type the word gamma, otherwise treat these as you would any other variable We will solve the heat equation U-60<<6, 20 with boundary/initial conditions u(0, t) = 0, u(6, t) 0, and u(,0) - 0
The solution is the zero function for all values of x and t.
To solve the heat equation u_t = 60u_xx with the given boundary and initial conditions, we can use separation of variables. We assume that u(x, t) can be written as a product of two functions, X(x) and T(t), such that u(x, t) = X(x)T(t).
Substituting this into the heat equation, we have:
X(x)T'(t) = 60X''(x)T(t)
Dividing both sides by 60X(x)T(t), we get:
T'(t)/T(t) = 60X''(x)/X(x)
The left side of the equation only depends on t, while the right side only depends on x. Since both sides are equal to a constant, we can set them equal to -λ², where λ is the constant.
T'(t)/T(t) = -λ²
X''(x)/X(x) = -λ²
Now, let's solve these two equations separately:
T'(t)/T(t) = -λ²
This is a separable ordinary differential equation. Integrating both sides with respect to t, we get:
∫ T'(t)/T(t) dt = ∫ -λ² dt
ln|T(t)| = -λ²t + C₁
Taking the exponential of both sides, we have:
T(t) = e^(-λ²t + C₁)
T(t) = e^(C₁) * e^(-λ²t)
T(t) = A * e^(-λ²t), where A = e^(C₁)
Now, let's solve the second equation:
X''(x)/X(x) = -λ²
This is also a separable ordinary differential equation. Integrating both sides with respect to x, we get:
∫ X''(x)/X(x) dx = ∫ -λ² dx
∫ (X''(x)/X(x)) dx = -λ²x + C₂
Using the fact that X''(x) = d²X(x)/dx², we can rewrite the equation as:
∫ (d²X(x)/dx²)/X(x) dx = -λ²x + C₂
∫ (d²X(x)/dx²) / X(x) dx = ∫ -λ² dx
∫ (1/X(x)) d²X(x)/dx² dx = -λ²x + C₂
Integrating both sides again, we have:
ln|X(x)| = -λ²x + C₂x + C₃
Taking the exponential of both sides, we get:
X(x) = e^(-λ²x + C₂x + C₃)
X(x) = e^(-λ²x) * e^(C₂x) * e^(C₃)
X(x) = B * e^(-λ²x) * e^(C₂x), where B = e^(C₃) * e^(C₂x)
Putting the solutions for T(t) and X(x) together, we have:
u(x, t) = X(x)T(t)
u(x, t) = (B * e^(-λ²x) * e^(C₂x)) * (A * e^(-λ²t))
We can combine the constants A and B into a single constant C:
u(x, t) = C * e^(-λ²x) * e^(C₂x) * e^(-λ²t)
Applying the boundary condition u(0, t) = 0, we have:
u(0, t) = C * e^(-λ²0) * e^(C₂0) * e^(-λ²t) = 0
This implies that C * e^(-λ²t) = 0. Since e^(-λ²t) is never zero, we must have C = 0.
Therefore, the solution to the heat equation with the given boundary and initial conditions is: u(x, t) = 0
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Explanation on how to solve these problems (not answers to the problems).
Answer:
..
Step-by-step explanation:
First, you need to make sure that you know a few things.
1. A line is 180 degrees
2. Angles with the small boxes on them are right angles.
3. Angles that are across from each other are the same amount of degrees...
For example, look at angle 2, you can see that directly across from it is the angle 35 degrees, this makes angle 2 35 degrees as well.
In order to find angle 1, you need to subtract 35 from 180, to see how much is needed to fill the line, in this case it is 145.
So, angle 1 is 145 degrees, and angle two is 35.
One more thing, angles 1 and 7 are the same and so are 2 and 6 because they are on the same line, I can't remember why, but they are.
find the slope of the line:
Find the area of the figure
Answer:
145
Step-by-step explanation:
Answer:
19 + 13 = 32 x 10 = 320 divided by 2 = 160yd2
Formula of a trapezoid:
B1 (base 1) + B2 (base2) x Height x 1/2 (basically dividing by 2).
Base 1 was 19
Base 2 was 13
and 10 was your height
And then divide by 2. ( x 1/2)
Please answer the following
please explain how you got your answer
Answer:
1/4 or 25%
Step-by-step explanation:
Out of 12 students, 3 liked Hamlet 3/12 is 1/4 simio lidies and 1/4 can be 25%
Answer:
1/4 would be the answer
Step-by-step explanation:
There are 12 total students in the class, and 3 of them liked Hamlet best. So the chances of randomly picking a Shakespeare student that likes Hamlet best is 3/12. If we simplify this answer, we would get 1/4.
HELP!!!! If point P(-6,4) is translated 3 units right and 2 units down, what are the coordinates of P''?
Answer:
P" is then (-3, 2).
Step-by-step explanation:
If the point P(-6, 4) is translated 3 units to the right, the x-coordinate increases by 3 from -6 to -3 and the y-coordinate decreases 2 units from 4 to 2.
P" is then (-3, 2).
Answer:
Answer:
P" is then (-3, 2).
Step-by-step explanation:
Find the volume of this triangular pyramid.
Answer:
volume = 80 in³
Step-by-step explanation:
base area = 8 x 6 x 0.5 = 24 in²
volume = 24 x 10 x 1/3 = 80 in³
Help! Will give brainliest and 10 points!
Answer:
-3a^2 - 6a - 10
Step-by-step explanation:
You are subtracting 10a^2 + 6a + 2 from 7a^2 - 8.
You can set it up like the problem shows you, and subtract each term in the second line form a like term in the top line.
7a^2 -8
(-) 10a^2 + 6a + 2
-----------------------------
-3a^2 - 6a - 10
Answer: -3a^2 - 6a - 10
To write a polynomial in standard form, write the _____ of the terms in descending order.
Answer:
Step-by-step explanation:
Write the sum of the terms in descending order.
Need someones help on this!
Answer:
1st, 3rd, and 4th box.
Step-by-step explanation:
9^5=59049
9^2=81 9^3=729 729*81=59049 yes
9^5=59049 59049x9=531441 no
9^4=6561 6561*9=59049 yes
9^2=81 81x81=6561 6561*9=59049 yes
9^3=729 729x729=531441 no
Answer:
The answer is the third one or (9^(4) (9)
Step-by-step explanation:
simplify nine to the power of -53×9 to the power of 37
Answer:
Is this for your homework
Step-by-step explanation:
someone please help!!
Answer: -7
Step-by-step explanation:
In order to find rate of change, we use two points (0,70) and (3,49).
rate of change = (y2 - y1)/ (x2 - x1)
= (49 - 70) / (3 - 0)
= -21/3
= -7
plss help meee
i need help on this and it's dueeeee
i will put brainliest for first answer plss help
Step-by-step explanation:
Storage Space of Shed = Volume of Shed.
Volume of Shed = Volume of Rectangular level
+ Volume of Triangular roof
Volume of Rectangular Level =
Length x Width x Height
=
[tex]12 \times 6 \times 8 \\ = 576 {ft}^{3} [/tex]
Volume of Triangular Roof =
Area of Triangular side x Length
=
[tex] \frac{1}{2} \times base \times height \times length \\ = \frac{1}{2} \times 6 \times 4 \times 12 \\ = \frac{1}{2} \times 288 \\ = 144 {ft}^{3} [/tex]
Volume of Shed = 576 + 144
=
[tex]720 {ft}^{3} [/tex]
a company manufactures 2 models of mp3 players. let x represent the number (in millions) of the first model made, and let y represent the number (in millions) of the second model made.
The company's revenue can be modeled by the equation
t(x,y) = 110x + 180y + 3x^2 - 4y^2 - xy
Find the marginal revenue equations
rx(x,y)=
ry(x,y)=
We can acheive maximum revenue when both partial derivatives are equal to zero. Set Rx = 0 and Ry = 0 and solve as a system of equations to the find the production levels that will maximize revenue.
Revenue will be maximized when:
x=
y=
The equations of values of x and y =0 that will maximize the revenue.
The marginal revenue equations, to calculate the partial derivatives of the revenue function with respect to each variable, x and y.
Given the revenue function:
t(x, y) = 110x + 180y + 3x² - 4y² - xy
The marginal revenue with respect to x, rx(x, y), the partial derivative of t(x, y) with respect to x, while treating y as a constant:
rx(x, y) = ∂t/∂x = 110 + 6x - y
Similarly, the marginal revenue with respect to y, ry(x, y),the partial derivative of t(x, y) with respect to y, while treating x as a constant:
ry(x, y) = ∂t/∂y = 180 - 8y - x
The production levels that will maximize revenue, both marginal revenue equations equal to zero and solve as a system of equations.
Setting rx(x, y) = 0:
110 + 6x - y = 0
Setting ry(x, y) = 0:
180 - 8y - x = 0
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Maria's fish tank has 17 liters of water in it. She plans to add 5 liters per minute until the tank has more than 52 liters. What are the
possible numbers of minutes Maria could add water?
Use t for the number of minutes.
Write your answer as an inequality solved for t.
Answer:
t < 7
Step-by-step explanation:
52 > 5t + 17
52 - 17 > 5t
35 > 5t
35/5 > t
t < 7