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

Write the equation of the line passing throught each of the given pairs of points. Write your result in slope-intercept form, where possible.

(-1,3 and (4,-2) cannot figure this out..: let f(x)=x^3-1 and g(x)=x^2+x+1. find (f/g)(x).