Four students each calculated the volume of a sphere with a radius of 9 centimeters and they got four different answers.

Han thinks it is 108 cubic centimeters.

Jada got 108pi cubic centimeters.

Tyler calculated 972 cubic centimeters.

Mai says it is 972pi cubic centimeters.

Do you agree with any of them? Explain your reasoning.

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.