Which statement is true about a scale ?

Anyone know? will mark brainliest if you're correct!

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 x = -2, then x 2-7x+10 equals a. 0 b.20 c.28