### Home > CCA2 > Chapter 5 > Lesson 5.1.2 > Problem 5-32

5-32.

Barnaby’s grandfather is always complaining that back when he was a teenager, he used to be able to buy his girlfriend dinner for only

If that same dinner that Barnaby’s grandfather purchased for

sixty years ago now costs , and the price has increased exponentially, write an equation that will give you the costs at different times. Begin by defining variables.

Letthe number of years

Letthe cost of a dinner

You need to write an equation of the form.Use the points

and to write and solve a system of equations. How much would you expect the same dinner to cost in 60 years?

Let

in your equation from part (a).