The area bounded by the curve $y=x^2+3, y=x, x=3$ and $y$-axis is

The area bounded by the curve $x^2=8 y$ and the straight line $x-8 y+2=0$ is

If a curve $y=a \sqrt{x}+b x$ passes through the point $(1,2)$ and the area bounded by this curve, line $x=4$ and the X -axis is 8 sq . units, then the value of $a-b$ is

The area bounded by the curve $x=2-y-y^2$ and the Y -axis is