Evaluate each expression if a = 12, b = 9, and c = 4. 2c(a + b)

answers
312
336
45
168

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.