Help pls thank you im so confused

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?

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons