An acute angle can have all of the following measures except a.89 b.45 c.10 d.0

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

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?