Your diagram leaves much to be desired ... I interpret it to mean a parabola that has x-intercepts at (0,0) and (0,10) where the slope of the tangent to the parabola makes a 30 degree angle with the x-axis at (0,0).
If that is the case, then see the attached graph. If you mean something else entirely (in other words, my interpretation is completely wrong), then you’ll have to provide a more concise explanation of what you are looking for ...
I'm glad you were able to get that information from the picture, skeeter. I thought it was (0, N) rather than (0, 10) and completely missed the angle the first time I looked!
The fact this parabola has horizontal line of symmetry and goes through (0, 0) and (0, 10) means it can be written $\displaystyle x= a(y-0)(y- 10)= ay^2- 10ay$. The derivative at (0, 0) is $\displaystyle x'= 2a(0)- 10a= -10a= tan(30)$.
my ipad turned the pic sideways making me think the axis was horizontal ... looks like y-intercepts (0,0) and (0,10) instead of what I interpreted
revised graph attached