# Math Help - evaluate the sum

1. ## evaluate the sum

Evaluate the sum

2. Originally Posted by tbenne3
Evaluate the sum
What is the first term of the series?
What is the common diffidence of this arithmetic progression?
What is the number of terms?
What is the formula for the sum of the arithmetic progression?

3. Originally Posted by tbenne3
Evaluate the sum
$7\left({(40)(41)\over 2}\right) +8(40)$