Final answer:
To find f(-3), substitute -3 for x in the equation f(x) = -3x + 4. The answer is 13.
Step-by-step explanation:
To find f(-3), we substitute -3 for x in the equation f(x) = -3x + 4.
So, f(-3) = -3*(-3) + 4 = 9 + 4 = 13.
Therefore, the answer is B. 13.