### Home > CCA2 > Chapter 10 > Lesson 10.1.1 > Problem 10-9

10-9.

Write a formula for the

*n*^{th}term of each of the following series. Homework Help ✎3 + 10 + 17 + …

20 + 11 + 2 + …

The terms are increasing by 7 each time.

*t*(1) = 3

*t*(*n*) = 3 + 7(*n* − 1)

Simplified, this becomes *t*(*n*) = 7*n* − 4.

What is added to each term to get the next?

What is the first term?