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Use Polya's four-step problem-solving strategy and the problem-solving procedures presented in this lesson to solve the following exercise. On three examinations Dana received scores of86,89,

Use Polya's four-step problem-solving strategy and the problem-solving procedures presented in this lesson to solve the following exercise.

On three examinations Dana received scores of86,89, and72.

What score does Dana need on the fourth examination to raise his average to86?

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