How to solve 2+(n-1)3

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

For what values of x is x2 + 2x = 24 true?

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?