What is the asnwer worked out to m-9=-13

Thus is a linear equation, so you want to isolate m so you can compare the variable m to a constant.

You begin by getting rid of -9 by adding 9 (its opposite) since a negative plus a positive can me zero. Then you add 9 to (-13) which is the same as 13-9 but with a negative value, so you get -4.

The answer is -4

Ithink it would be 160 people

7for nonmembers i think