The diameter is 21, so the radius is 10.5. The area of a circle is πr^2, so 10.5^2π, or 110.25π. The pool is filled 9 inches from the top, so it is 3.5 feet - 9 inches high, 9 inches is 0.75 feet, so 2.75 feet filled. Now multiply 110.25π by 2.75 to get 303.1875π and then 952.4916, closer to 952 cubic feet.
Solve the top equation to get on variable on one side 2x-y=6 -y=-2x+6 y=2x-6 then plug in the coordinate for x and y for both equations. if both equations are true then it’s a solution 2=2(2)+6 2=10
