2x (x + 4) -12x

if x=-3

Which of the following three dimensional figures has a circle as it’s base

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.