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College math

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Highway curves If a circular curve without any banking has a radius of R feet, the speed miles per hour for the curve is L=1.5 R.
(a.)Find the speed limit for a curve having a radius of 400 feet.
(b.) If the radius of a curve doubles, what happens to the speed limit?
(c.) A curve with a 40 mile per hou speed limit is being designed What should be it's radius?

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