## The function S(n) is defined below. Which of the following are equal to S(7)? Check all that apply. S(n) = 3n – 1 A. 22 B. 20 C. S(6) + 3 D. S(4) + S(3)

ANSWER The correct answer is A. EXPLANATION The given systems of equations are If we multiply the first equation by 7 we get, If we multiply the Adding equation (3) and (4) gives, We can see that f has been eliminated from the equation, and hence we can find g and use it to find