The volume of your sphere is then (4/3)*pi*r^3 = (4/3)*3.14159265*18^3 = 24429.024 cubic units. That is not one of the answer choices. The closest choice appears to be D.
Step-by-step explanation: Find the Rise over run. Easy as that, find two points on the line and see how many times it rises and how many times it runs.
