Evaluate the surface integral ${}_{S}f(x,y,z)dS$ using a parametric description of the surface. $f(x,y,z)=3x,$ where $S$ is the cylinder $x^2{z}^2=25,$ for $0y4$

Write a parametric description of the given cylinder using $u=$ and $v=y.$

$r(u,v)=$

$$

$$ where $0$sus $$ and $$ svs $$

$($Type exact answers.$)$