PLEASE help me please hurry and correctly

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.

Describe a situation where it would be beneficial to round decimals to the nearest dollar. explain why you would use rounding in that situation.

How many possible outcomes are there when sharya spins the spinner shown below twice?