Given ∆qrs ~ ∆xyz, what is the value of tan(q)

Arrange these numbers from least to greatest 3/5 5/7 2/9

Find the quotient. 50a2 – 98b2 -5a +7b

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?