### Home > CC4 > Chapter 5 > Lesson 5.2.3 > Problem 5-82

A calculator manufacturer offers two different models for students. The company has sold 10,000 scientific calculators so far and continues to sell 1500 per month. It has also sold 18,000 graphing calculators and continues to sell 1300 of this model each month. Homework Help ✎

If at some month,

*m*, the number of scientific calculators sold is equal to the number of graphical calculators sold, then write an equation that represents this situation.When will the number of scientific calculators sold equal the number of graphical calculators sold? That is, solve your equation from part (b) for

*m.*

Write an expression representing the number of scientific calculators in terms of the number of months (*m*).

Total number of scientific calculators sold so far: 10000 + 1500*m*

Now, write an expression for the graphing calculators.

*m* = 40, meaning that in the 40th month, they will have sold the same number of scientific calculators and graphing calculators.