Help me answer this question about the shaded area!

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?

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have