An engineer uses this formula to determine the strength of a metal beam. 6.2(0.1x−3.1)−2.5(0.4−1.6x)Which expression is equivalent to the formula?

A
3.38x – 20.22

B
4.62x – 20.22

C
3.38x – 18.22

D
4.62x – 18.22

i need help plz tell me the right answer for y benchmark

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?