Acalculator 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?

A calculator manufacturer offers two different models for students, a scientific calculator and graphing calculator. Initially they already sold 10,000 sci cal and will continue to sell 1500 per month, while the graph calc sold 18,000 and continues to sell 1300 per month. The two calculators will have the same sales after 40 months.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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it would rotate about 180 degrees.