What is the value of x to the nearest tenth?

What is the slope of a line that is perpendicular to y = 3x + 1

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

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?