For each halve it would be a full or for all of the halve together it would be 6/2
Replace n with 13 and simplify
an = 84+(n-1)*(-6)
a13 = 84+(13-1)*(-6)
a13 = 84+(12)*(-6)
a13 = 84+(-72)
a13 = 84-72
a13 = 12
Answer: Choice A) 12
The answer as a decimal is 0.06507705122
Hope this helps!
