The function f(x) = -16x2+20x+5 models the height in feet of a football t seconds after it is thrown.

A. Write the quadratic inequality that can be used to determine when the football is at least 9 feet off the ground.

B. Solve the quadratic inequality and interpret the solutions

C. What is the maximum height of the football and when does it reach that height?

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;

it would take 5 hours i think idk i'm not that good at math.can you me with my questions i need asap.