Please explain too In Exercises $14$ and $15,$ find a way to apply Green's theorem to compute ${\displaystyle \underset{C}{\overset{\phantom{}}{}}}F*ds$ for the given vector field and nonclosed curve.

$15.F=(y-1)+e^{y^5}j$;$C$ is the piece of the parabola $y=2-x^2$ starting at $(-1,1)$ and ending at $(1,1).$