## Precalculus (6th Edition) Blitzer

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