If pp and qq vary inversely and pp is 23 when qq is 6, determine qq when pp is equal to 69.

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?

With number 11 ( show how you got the answer)

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab