$15-4)$ A $+2$ Precent grade intersects with a $-1$ percent grade at station

$(535+24\mathrm{.}26)$ at an elevation of $300$ ft if the design speed is $65$ mph

determine:

A$)$ the minimum length of vertical curve using the rate of vertical

curvature

B$)$ the stations and elevations of BVC and EVC

C$)$ Elevation of each $100$ ft station

D$)$ the station and elevation of the high point