3m x 7p, 21mp, -2y x 6b, -12by, 8s x 2d x 5t, 80dst, -4e x -2f x 3p, 24efp, -2d x 3a x 4b, -24abd, 7y x 7, 49y, 12 x -3h, -36h, 5n x -2m x 6, -60mn, p x q x 12 x 4y, 48pqy, Evaluate 3mn if m = 2 and n = 5 , 30, Evaluate -3pqr if p = 1, q =3, r = 4, -36, Evaluate 9gh if g =-3 and h = -2, 54, 4y x y , 4y2, 7p x 3p, 21p2, 5m x 4m x 2p, 40m2p, 9g x -2g x 2g, -36g3.

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