Sam evaluated the expression x² y for x = 7 and y = 9. He got a value of 49. Which of the following statements is correct? Sam's answer is correct.
Sam forgot to multiply.
Sam squared wrong.

Asphere has a diameter of 10 in. what is the volume of the sphere?

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?

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct