### Home > INT3 > Chapter 10 > Lesson 10.3.3 > Problem 10-187

10-187.

What is the sum of each series? Homework Help ✎

11 + 12 + 13 + … + 40

90 + 84 + 78 + … + 24

Find the sequence that describes the series.

*t*(*n*) = 10 + *n*

Find which term is 40.

(40) = 10 + *n*

30 = *n*

Find the sum using the formula

See part (a).