What is 2+2i am just confused can you me

Match each expression with its simplified form.

Which compound inequality could be represented by the graph?

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.