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A -6.00% grade and a +2.00% grade intersect at station 20+00. The two grades are to...

A -6.00% grade and a +2.00% grade intersect at station 20+00. The two grades are to be connected by a vertical curve 400 ft long. The elevation of the BVC is 348.52.
What is the...
a. Elevation on the curve of the low/high point?
b. Elevation of the curve at station 19+00
c. Elevation of the tangent at station 21+00
d. Elevation of the curve at station 21+50
e. Elevation of the curve at station 18+50
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