book Maths Puzzle Numerical Ability

Hi,
Can anyone answer this?
In cubic meters,how much greater is the volume of a cylinder with height 21m and a radius 12m than the volume of a square prism with height 21m and base 12m on a side?

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book Other Question
Write this expression in simplest form.

4r^2 - 25s^2/2r^2 + 3rs - 20s^2

Thanks! Please help me solve:

sqrt*(x) = sqrt*(x - 2) - 4