Answer
The correct graph is $D.$
Work Step by Step
The given inequality is
$\Rightarrow 3(2-f)\leq 15$
Use distributive property.
$\Rightarrow 6-3f\leq 15$
Subtract $6$ from each side.
$\Rightarrow 6-3f-6\leq 15-6$
Simplify.
$\Rightarrow -3f\leq 9$
Divide each side by $-3$. Reverse the inequality symbol.
$\Rightarrow \frac{-3f}{-3}\geq \frac{9}{-3}$
Simplify.
$\Rightarrow f\geq -3$
The solution is $ f\geq -3$.
Use a close circle because $-3$ is a solution.
Shade the number line on the right side.
Hence, the correct graph is $D.$
