Question

helppppp! :)
Given the functions f(n) = 11 and g(n) = −2(n − 1), combine them to create an arithmetic sequence, an, and solve for the 31st term.

an = 11 − 2(n − 1); a31 = −49

an = 11 − 2(n − 1); a31 = −51

an = 11 + 2(n − 1); a31 = 71

an = 11 + 2(n − 1); a31 = 73