solve this question$(2$p$)$ Let $(x,Y)$ be a continuous random variable with a simultaneous

density function

$f(x,y)=\{\begin{array}{ccc}\frac{3}{8}(x+2y{)}^2,& (x,y)in(0,& 1{)}^2\\ 0,& \text{o}\text{t}\text{h}\text{e}\text{r}\text{w}\text{i}\text{s}\text{e}& \end{array}$

Find the marginal density functions of the random variables $x,Y$ and

compute $p(Y>2x).$