WILL GIVE BRAINLIEST- pls solve all of these or at least four according to instructions and tell me exactly how to do work in easiest way possible thanksss and don’t give me a link

The line containing the midpoints of the legs of right triangle abc where a(-5,5), b(1, 1), and c(3, 4) are the vertices.

Negative 5 1/12 + negative 4 1/4 + 6 3/4

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?