Answer:
We have strong evidence that on average, students study less than 150 minutes per night during the school week
Step-by-step explanation:
Normal distribution:
mean     μ₀ = 150 
Sample:
Sample size    n = 272 
Sample mean   x = 141
Sample standard deviation  s  = 66
The standard error of the sample mean  SE = σ /√n
SE = 66/√272
SE = 66 / 16,49
SE = 4
Test Hypothesis:
Null hypothesis                            H₀             x  =   μ₀ 
Alternative hypothesis                Hₐ            x <    μ₀
z(s)  test statistics is:
z(s)  =  ( x  -  μ₀ ) / s/√n
z(s) = - 9 /4
z(s) =  -  2,25
p-value  for that z(s)      p-value  = 0,0122
Then for α =  0,05 p-value < 0,05
We are in the rejection region we need to reject H₀
 
        
             
        
        
        
4(5x + 7) = 128 
First, I'd do distributive property and get: 
20x + 28 = 128 
Then, subtract 28 from each side. 
20x = 100 
Next, I'd divide 100 by 20 = 5 
x = 5 
4 *(5(5) + 7) = 128 
5 * 5 = 25
4 * (25 + 7)
4 * 32 = 128
Therefore, the perimeter = 2l + 2w 
l = 4 
w = 5x + 7 
BUT we know that x = 5 
w = 5(5) + 7 = 32
2(4) + 2(32) 
8 + 64 = 72 
Therefore, the perimeter would be 72 inches. 
 
        
             
        
        
        
Y+2x=4
To get the answer subtract the 2x from both sides making it y = -2x+4
the slope is -2 and the y-intercept is 4
        
             
        
        
        
I think you should divide because there is a HINT it gives you the total so divide 5[185
        
             
        
        
        
Answer:
The volume formula is pi r^2h because it is similar to the formula to the area of a circle with an extra addition of the height variable, since a cylinder is just a circle with depth. The surface area formula is 2pirh +2pi r^2 because it measures the area of both circles as well as the depth. This formula is similar to the circumference formula of a circle.
Step-by-step explanation:
Mark me brainliest pls