Sorry i’m kinda dumb

Bring the fraction a/a-4 to a denominator of 16-a^2

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 12611261 chips and a standard deviation of 118118 chips. (a) determine the 2626th percentile for the number of chocolate chips in a bag. (b) determine the number of chocolate chips in a bag that make up the middle 9696% of bags. (c) what is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies?

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?