Use the four-step procedure for solving variation problems given on page 445 to solve Exercises 21–36.The height that a ball bounces varies directly as the height from which it was dropped. A tennis ball dropped from 12 inches bounces 8.4 inches. From what height was the tennis ball dropped if it bounces 56 inches?

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Solving Variation Problems 1. Write an equation that models the given English statement. 2. Substitute the given pair of values into the equation in step 1 and find the value of k, the constant of variation. 3. Substitute the value of k into the equation in step 1. 4. Use the equation from step 3 to answer the problem's question.