If c=2πr what is r equal to? a) r = c - 2π b) r = c + 2π c) r = 2πc d) r=c/2π

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?