Question

How do you find the sum of the arithmetic sequence -15 + -3 + 9 + 21 + 33 + 45 + 57 + 69 + 81 + 93?

Answer 1

The sum of an arithmetic sequence is given by the formula `s_n = n/2(a + t_n)`

Explanation:

`s_10 = 10/2(-15 + 93)`

`s_10 = 5(78)`

`s_10 = 390`

The sum of your sequence is 390.

Hopefully this helps!