Solve this
6x+7=8x−15

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

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?

What’s the answer ? use the picture to see the problem