Which function has a vertex at the origin? f(x) = (x + 4)^2 f(x) = x(x – 4) f(x) = (x – 4)(x + 4) f(x) = –x^2

Darian wants to build a regulation size pool table that is 9 feet in length.he plans he ordered are 18 by 36 inches. what is the scale factor of the dilation he must use to build a regulation pool table