Final answer:
To find f(-2) using the function A(x) = 5x, substitute -2 for x and solve for f(-2). The answer is -10.
Step-by-step explanation:
To find f(-2) using the function A(x) = 5x, we need to substitute -2 for x in the function.
So, f(-2) = 5(-2) = -10. Therefore, the correct answer is A. -10.