Choose the correct simplification of the expression -4x^2(6x-5x^2-5)

Really need on these. i have no idea what to do

Can someone me out here and the tell me the greatest common factor

Ke’ajah has a coupon for 1/3 off the regular price, t, of a tent. which expression represents the price of the tent using the coupon? select the two correct expressions. a. 1/3t b. 2/3t c. t - 1/3 d. t - 2/3 e. t - 1/3t f. t - 2/3t