Question: A 5 8 8 - ft crest vertical curve has a design speed of 5 0 mph . If the initial grade of the curve

A 588-ft crest vertical curve has a design speed of 50 mph. If the initial grade of the curve is
+3%, what is the final grade of the crest curve?
(a)+10%
(b)-4%
(c)-3%
(d)-5%
I know this one has already been solved but please write out where all the values came from. I don't understand where the 2,158 came from in the solution. Thanks

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