0.4.x -0.1=0.7 -0.3(6-2x)

Find two rational expressions that have the difference of 2-n/n-4

Plz me i need i will give a brain

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?