Given that $V(E)={}_{E}dV,$ find the volume of the tetrahedron bounded by the coordinate planes and $x+y+z=3.$

Given $F(x,y)=x{y}^{2}i+x^{2}yj$ and $C$:$r(t)=$ where $0t1,$ find $($a$)$ the potential function of $F$ and $($b$)$ use the potential function to calculate the line