In anchorage, alaska, the temperature is 31 degrees at 7: 00am. it rises 12 degrees by noon, but then drops 40 degrees overnight. what is the final temperature? showing how you got the answer is greatly appreciated as well .

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.