What is the domain and range ? is it a function ?

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

How far could you drive on 50 gallons of gas

Need match the functions with correct transformation. f(x) = -3x f(x) = |x-1|+3 f(x) = √(x+3) 1/2x² f(x) = (x+1)²-3 4|x| 1. compress by a factor of 1/2 2. stretch by a factor of 4 3. shift to the left 3 4. shift to the left 1 5. shift up 3 6. reflection