Find $\frac{4}{d}$ and $\frac{c^{3}y}{d^2}$ if possible, and find the slope and concavity $($if possible$)$ at the point corresponding to $t=9.$

$x=t+10$

$y=t^2+6t$

In the answer box below, type in the numerical value found for concavity.

$$11$ Grading Rubric for solution on paper: Correctly showed$/$explained how to find the first derivative in simplest terms $(4$ points$)$; correctly found the value for slope $(1$ point$)$; Correctly showed$/$explained how to find the second derivative in simplest terms $(4$ points$)$; correctly identified whether the concavity is concave upward or concave downward $(1$ point$).$