# Chapter 12 - Section 12.2 - Arithmetic Sequences - 12.2 Exercises - Page 857: 6

a. $-10,10,30,50,70$ b. $20$ c. see below .

#### Work Step by Step

a. $a_{1}=-10+20(1-1)=-10$, $a_{2}=-10+20(2-1)=10$, $a_{3}=-10+20(3-1)=30$, $a_{4}=-10+20(4-1)=50$, $a_{5}=-10+20(5-1)=70$ (b) $10-(-10)=30-10=50-30=70-50=20$ The common difference is $20$. (c) graphed using desmos.com

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