What does it imply?

$7.$ An encyme catalyses the conversion of $x$ into $Y$ with a $K_m$ value of $4mM$ for substrate and a $K_{\text{e}\text{a}\text{t}}$ value of $36s^{-1}.$

$($b$)$ Determine the fraction of $V_{\text{m}\text{a}\text{x}}$ that is achieved when $x$ is equal to $0\mathrm{.}25K_m,3K_m$ and $50K_{2+3}$

Or$,$

$8.($a$)$ In the above numerical, If the rate of reaction at $1mmx,$ is $5\mathrm{.}4107$mole$\frac{s}{m}in,$ what is the enzme eoncentration in the reaction? Express your answer in $nM.$

$($b$)$ If $K_m=2mM,$ and $)$ when $[$S$]=2mM,$ what is the velocity, $v_0$ for the reactiont when $[$S$]=18mM?$