$1-4$ Evaluate the line integral $by$ two methods: $(a)$ directly and

$(b)$ using Green's Theorem.

$o{\displaystyle \underset{C}{\overset{\phantom{}}{}}}{y}^{2}dx+x^{2}ydy,$

$Cis$ the rectangle with vertices $(0,0),(5,0),(5,4),$ and $(0,4)$