Solving Direct Variation Problems – Practice Problems

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If y varies directly as x, and x = 9 when y = 15, find y when x = 33.
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If c varies directly as the square root of d, and c = 14 when d = 64, find c when d = 324.
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The cost of a pizza varies directly as the square of its radius. If a pizza with a 6 inch radius costs $8.00, how much should a pizza with an 11 inch radius cost?
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If p varies directly as the cube of q, and p = 26 when q = 2, find p when q = 5.
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The weight of an object on Earth varies directly as the weight of the same object on the moon. A 300 pound object would weigh 48 pounds on the moon. How much would a 65 pound object weigh on the moon?
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The distance required to stop a car varies directly as the square of its speed. If 250 feet are required to stop a car traveling 60 miles per hour, how many feet are required to stop a car traveling 96 miles per hour?
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