On a map 1in=18 miles. on the map if the distance between two cities is 11.25 inches. what is the actual distance in miles between the cities?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?