Answer
$\{0\}\cup[9,\infty)$
Work Step by Step
Step 1. Factor the inequality as $x^2(x-9)\geq0$. Then the boundary points are $x=0,9$
Step 2. Using the test points to examine signs across the boundary points, we have
$...(-)...(0) ...(-)...(9)...(+)...$
Thus the solutions are $x\geq9$ plus $x=0$
Step 3. We can express the solutions on a real number line as shown in the figure.
Step 4. We can express the solutions in interval notation as $\{0\}\cup[9,\infty)$
