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What are the domain and range of the function f(x)=2^x+1

Which expression is equal to (f+g)(x)?

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.