Pls help I need the answer

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Factor the polynomial. b^2 + 4b + 4

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.