Two submarines, one red and one blue, started rising toward the surface at the same time. they each rose at a constant speed. the red submarine started rising from an altitude of 80 meters below the surface. after 30 seconds it was 60 meters below the surface. The following equation gives the altitude (in meters relative to the surface) of the blue submarine as a function of time (in seconds) A=-90+0.6t

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.