Sasha has nickels and one dollar bills in her pocket. The number of nickels is nine more than three times the number of one dollar bills. Let 0 represent the number of one dollar bills. Write an expression for the number of nickels.

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Two cooks purchase plates and cups at the same store. The first cook bought 6 plates and 10 cups for a total of $21.50. The second cook bought 9 plates and 4 cups for a total of $18.50. What is the price of each type of item purchased?

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