Simplify 13 to the second power pretty : 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?

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

When is g(x) = 0 for the function g(x) = 5.23x + 4?