Let R be the region in the first quadrant bounded above by y=4x+3 and y=x^2+3

A. Find the area of R

I did this part and I got 10.6667. Can anyone confirm this?

B. The line x=c divides R into two regions. If the area of region R to the left of x=c is (2/3) the area of the region, find the value of c.

I need help with this.

C. The line y=a divides R into two regions of equal area. Find the value of a.

Thank you all!