Please help me with this question guys, I’m going to fail:(

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?

Write the expression 7x^3-28xy^2 as the product of 3 factors

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost