Question

What is the sum of a 17–term arithmetic sequence where the first term is 7 and the last term is –105?

Answer 1

–833

–893

–913

–943

Answer 2

\[\large Sum = \frac{n}{2}(First + Last)\]

Here first is 7 and last is -105 and n = 17 plug in and find the sum..

Answer 3

What do you get after solving ??