Peter is buying 4 calculators to donate to his class. each calculator costs $9. he is also buying a $1 bottle of water for himself. he thinks his total will be $37. which expression could be used to estimate the reasonableness of peters total

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.