Atriangular pyramid is cut by a plane. in which case is the cross section a quadrilateral?

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.