Does this graph show a function? how do you know??

Ihave trouble finding the nth term of a linear sequence

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.

5. (03.02)if g(x) = x2 + 3, find g(4). (2 points)1619811