Factor the expression below. 49a^2-25b^2

What signals you that factoring by grouping is the best method to use when factoring a problem?

Ajar contains a mixture of 20 black marbles, 16 red marbles, and 4 white marbles, all the same size. find the probability of drawing a white or red marble on the first draw. 125 12 01 next question ask for turn it in

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.