The wheel was first documented as being used in Mesopotamia (Iraq today) in 3500 B. C. The first steam powered vehicle that used wheels was invented in 1672 A. D. How long did it take for the wheel (from being invented) to get pushed by a machine?

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.