Find the slope of the line that passes through each pair of points #1 (-2,-5) (-7,10)
#2 (-2, -11) (5,6)
#3 (6,3), (-9,-11)

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?