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Algera 2; Solving Systems by Matrices

Algebra
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A small business borrows 90,000; some at 7%, some at 9%, and the rest at 10% interest. The annual interest is 17,110, and twice as much is borrowed at 7% as at 9%. How much money was borrowed at each rate of interest? Please answer with a matrix.

Oct 27th, 2014
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