Geometry math question no guessing and show work

It's C, because a coordinate multiplied by the scale factor equals the coordinate after dilation.

For instance, the coordinates in A are (12, 8). if you multiply each of those numbers by the scale factor, 1/2, you will get A' which is (6, 4). This is true of every coordinate in your equation, so you know that the answer is C.

X= 2 he can buy 2 packs of cards for $12 and an action figure for $3 so he would spend $15 in total plus the free poster