A meteorologist measures the temperature in downtown Denver at noon on each day for one year. The 365 readings average 57F and have standard deviation 20F. The meteorologist computes a 95% confidence interval for the mean temperature at noon to be

11 feet 6 inches and 8 feet 6 inches

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

step-by-step explanation:

the equation is going to be