Hi I am have troubles solving for a and b.

Sections 1,2 and 3 all join and are continuous. At points B and C the gradient at the end of one function is the same as the gradient at the beginning of the next.

For section 1, i.e. A to B, y=0.01x^2-1.2x+50

For section 2, i.e. B to C, y=ax^2+bx-250

For section 3, i.e. C to D, y=cx^2+dx+605

Point A is ( 0,e=50 )

Point B is ( 100,f=30)

Point C is ( 150,g )

Point D is ( h,0 )

I found e=50 and f =30.

I cant solve for the other unknowns??