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verbal description of the variation

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The force needed to keep a car from skidding on a curve varies jointly as the weight of the car and the square of the speed and inversely as the radius of the curve. it takes 3000 pounds of force to keep a 2000 pound car from skidding with radius 400 at 40mph. What force is needed to keep the same car from skidding when it takes a similar curve with radius 50 feet at 50 mph?

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A formula is composed to meet the needs in this task.

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First, we write the formula corresponding to the verbal description of the variation.
We say that z varies directly as x if there is a constant k such that z=kx
We say that z varies inversely as y if ...

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