Your answer is 21 for this one.
So, we know the sum of the first 17 terms is -170, thus S₁₇ = -170, and we also know the first term is 2, well

well, since the 17th term is that much, let's check what "d" is then anyway,
Answer:

Step-by-step explanation:

Answer:
when 6(2+4) -1 divided by 2.3 + 1 the answer is 36.5652174