Question

find the indicated term of the given arithmetic sequence. a1=105, d=-2, n =9

Answer 1

So, find the 9th term?
If the first term is 105 and the common difference is -2 then subtract 2 eight times to get the 9th term.

Answer 2

oh okay! I got 89 for my answer.Thanks

Answer 3

oh but I have a question. Why do I have to subtract 8 times with 2?

Answer 4

n=9 means 9th term. you have a1=105 as first term. To get from the first term to the 9th term is 8 steps away. Each step is -2 in size.