Find the term that must be added to the equation x^2−6x=7 to make it into a perfect square.

Simplify the expression. -2/5(10+15m-20n)

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?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')