$(4).(2$ points$)$ Given the following equations and $x=1,w=2,$ what is the value of $gra{d}_{w}1?$

$y=3x-w$

$z=5y^3$

$l=(z-3{)}^2$

$(5).(2$ points$)$ From above equations, if we want to minimize $l$ by changing $x$ with gradient

descent. With the learning rate is $0\mathrm{.}01,$ what is the value of $x$ after one iteration?