Answer:
The correct answer is A) (f+g)(x) = 15x - 2
Step-by-step explanation:
In order to complete a composite addition function, you need to add the two functions together combining like terms.
(f+g)(x) = f(x) + g(x)
(f+g)(x) = 3x - 10 + 12x + 8
(f+g)(x) = 15x - 2
