# Chapter 10 - Review Exercises - Page 1124: 28

a. $1.63n+38.73$ b. $81.11$ dollars.

#### Work Step by Step

a. Based on the given conditions, we have $a_1=40.36, d=1.63$ We have $a_n=a_1+(n-1)d=40.36+1.63(n-1)=1.63n+38.73$ (in dollars, for rock concerts $n$ years after 1994) b. For year 2020, we have $n=2020-1994=26$ and $a_{26}=1.63(26)+38.73=81.11$ dollars.

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