exam Maths Puzzle Numerical Ability

Find the volume of a right circular cone where the radius of the base is 21 in. and the height is 9 in. Give the exact value.

I think the formula is V=1/3 pie r squared h.

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exam Other Question
How many positive real solutions are there in:
f(x) = -2x^4 + 3x^3 + 7x^2 + 2
a. 0
b. 2
c. 1
d. None, there is no x-term after rowing two miles upstream, a rower passes a log in the river. he rows on for one more hour before turning around and rowing back to his starting point where the log has reach