C, 25. You take half of the variable B, so 5 in this case, because B=10. Then you square it. 5^2 is 25.
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Volume of a Cylinder = pi x r^2 x height
diameter = 10, so radius = 5
height = 6
Volume = pi x 5^2 x 6
Volume = pi x 25 x 6
Volume = 150pi
Answer: 150pi cubic feet
Hope this helps!