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

A-117.

An arithmetic sequence has  and . Write an equation for the sequence. What is ? Homework Help ✎

The general equation for an arithmetic sequence is .

Use to write an equation.

Use  to write another equation.

Solve the system of equations you wrote for and .

To find , substitute for in the equation that you wrote.