James bought 3 sweaters for $28 each. he bought 4 pairs of socks at $12 for each pair. about how much money did james spend on sweaters and socks? (give your answer to the nearest $10.)

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.