Graph y=0.4x in khan academy

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

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?