Look at this cube If the side lengths are halved, then which of the following statements about its surface area will be true?

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Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

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?