(2p)^4 = 2p*2p*2p*2p=16p^4
(7t)^2 = 7t*7t=49 t^2
(-5m)^3 = (-5m)*(-5m)*(-5m) = -125m^3
(-3y)^4 = (-3y)*(-3y)*(-3y)*(-3y) = 81y^4
