Find the segment of AB and the distance between the points A and B

Which expression is equivalent to sq-80

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?

The product of sin 30 degrees and sin 60 degrees is same as the product of