The dimensions of triangle b are three times the dimensions of triangle a. the area of triangle b is 162 cm2.

Find the given elements if matrix d:

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?

X+y=-4 x-y=2 use elimination with adding and subtraction