Hi guys patulong po(show your solution)

What is the product of the radical expression. (7-2square root) (8+2 square root)

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for 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?