I need help with number $7.$

In Problems $5-14,$ use Green's theorem to evaluate the given line integral.

$5.o{\displaystyle \underset{C}{\overset{\phantom{}}{}}}2ydx+5xdy,$ where $C$ is the circle $(x-1{)}^2+(y+3{)}^2=25$

$6.o{\displaystyle \underset{C}{\overset{\phantom{}}{}}}(x+y^2)dx+(2x^2-y)dy,$ where $C$ is the boundary of the region determined by the graphs of $y=x^2,y=4$

$7.o{\displaystyle \underset{C}{\overset{\phantom{}}{}}}(x^4-2y^3)dx+(2x^3-y^4)dy,$ where $C$ is the circle $x^2+y^2=4$

$8.o{\displaystyle \underset{C}{\overset{\phantom{}}{}}}(x-3y)dx+(4x+y)dy,$ where $C$ is the rectangle with vertices $(-2,0),(3,0),(3,2),(-2,2)$

$9.o{\displaystyle \underset{C}{\overset{\phantom{}}{}}}2xydx+3x{y}^{2}dy,$ where $C$ is the triangle with vertices $(1,2),(2,2),(2,4)$