# College math

posted by
**Shin**
.

Highway curves If a circular curve without any banking has a radius of R feet, the speed limitL.in 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?