### Home > INT3 > Chapter Ch10 > Lesson 10.2.1 > Problem 10-99

10-99.

Consider the series 8 + 1 + (–6) + (–13) + … + (–90). Homework Help ✎

How many terms are there?

What is the sum?

Write an expression for the sequence, and find *n* when *t*(*n*) = −90.

15