Find $d\frac{y}{d}x$ and $d^2\frac{y}{d}{x}^2,$ and find the slope and concavity $($if possible$)$ at the given value of the parameter. $($If an answer does not exist, enter DNE.$)$

Parametric Equations

Point

$x=\sqrt[\phantom{2}]{t},y=\sqrt[\phantom{2}]{t-1}$

$t=5$

$\frac{dy}{dx}=$

$\frac{d^{2}y}{d{x}^2}=$

slope

concavity:

$---$Select$--$