exam Maths Puzzle Numerical Ability

i have to find the volume of a sphere with a radius 3 cm.
i have to leave answer in terms of pie.

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exam Other Question

In isosceles triangles ABM and BMN, medians ME, BD, NP, and CM are dropped to the legs. If AE+ME+MC+BC=32, use a two column proof to determine AD+BD+BP+NP? Please help me to factor x^6-(1/729)