### Home > CCA2 > Chapter A > Lesson A.3.3 > Problem A-117

A-117.

An arithmetic sequence has . Write an equation for the sequence. What is

*? Homework Help ✎*

The general equation for an arithmetic sequence is .

Use to write an equation.

Use

Solve the system of equations you wrote for and

*.*

To find , substitute

*in the equation that you wrote.*