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3-52.

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 graphical models and continues to sell 1300 of this model each month. When will the sales of scientific calculators equal the sales of graphical calculators? Homework Help ✎.

Let x = time (months)
Write one expression for the number of scientific calculators sold and another expression for the number of graphical calculators sold after x months.

Set your expressions equal to each other and solve for x.