Answer
$t\geq -6$
The graph is shown below.
Work Step by Step
The given inequality is
$\Rightarrow -16\leq \frac{8}{3}t$
Multiply each side by $\frac{3}{8}$.
$\Rightarrow \frac{3}{8}\cdot (-16)\leq \frac{3}{8}\cdot \frac{8}{3}t$
Simplify.
$\Rightarrow -6\leq t$
Hence, the solution is $t\geq -6$.
Use a close circle because $-6$ is a solution.
Shade the number line on the right side.