I just need to know if I'm right and if I'm wrong please explain. I got answer A

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

a_n = 11 − 2(n − 1); a31 = −49

a_n = 11 − 2(n − 1); a31 = −51

a_n = 11 + 2(n − 1); a31 = 71

a_n = 11 + 2(n − 1); a31 = 73

Question

I just need to know if I'm right and if I'm wrong please explain. I got answer A


Given the functions f(n) = 11 and g(n) = −2(n − 1), combine them to create an arithmetic sequence, a_n, and solve for the 31st term.
 
a_n = 11 − 2(n − 1); a31 = −49 

a_n = 11 − 2(n − 1); a31 = −51 

a_n = 11 + 2(n − 1); a31 = 71 

a_n = 11 + 2(n − 1); a31 = 73

anonymous · Answer

a31 = 11 -2(31-1)  which disagrees with a

anonymous · Answer

so I solve that for answer?

anonymous · Answer

I got -71 but thats not an option @douglaswinslowcooper

anonymous · Answer

11 - 60 = -49 which agrees with a.  Sorry.

anonymous · Answer

You were mostly right. I was wrong.