Solve the formula for the indicated variable. a = 4πr² for r when r > 0 r =

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?

In angle pqr find the measure of

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?