## Calculus (3rd Edition)

The interval of $t$-values is $-\frac{1}{2}\leq t\leq 3$.
The coordinates $(0,-7)$ and $(7,7)$ correspond to $t=-\frac{1}{2}$ and $t=3$, respectively. Therefore, the interval of $t$-values is $-\frac{1}{2}\leq t\leq 3$.