Please help and i need an explanation. it is due tomorrow.

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?

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8

If f(x) = -5x + 1 and g(x) = x3, what is (gºf)(0)? enter the correct answer