The sum of 5th and 9th terms of AP is 72 and the sum of 7th and 12th term is 97 find AP

Find an equation of the line perpendicular to the graph.

One integer is 8 times another. if the product is 72, then find the integers

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?