Parallelogram abcd is reflected over the x-axis. what rule shows the input and output of the reflection, and what is the new coordinate of a'?

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.