### Home > AC > Chapter 5 > Lesson 5.1.2 > Problem 5-19

5-19.

A calculator manufacturer offers two different models for students. The company has sold

Let time (months)

Write one expression for the number of scientific calculators sold and another expression for the number of graphical calculators sold after

*months.*

Set your expressions equal to each other and solve for .

Use the eTool below to help you complete the problem.

Click the link at right for the full version of the eTool: *5-19 HW eTool* (Desmos)