Question

Find the indicated sum for the arithmetic series.
S15for 5 + 9 + 13 + 17 + ...

Answer 1

for this equation you need the formula

\[S_{n} = \frac{n}{2}[2a +(n - 1)\times d]\]

n = number of terms, 15 a = 1st term, 5 and

d is the common difference, or what is added to each term to get the next term.

Just substitute and then evaluate

Answer 2

alright I understand thanks!!

Answer 3

495