exam Maths Puzzle Numerical Ability

v=1/3 3.14 times r times r times h (solve for 3.14, r, h,)

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exam Other Question

is the suare root of x^2 = x an identity (true for all values of x) explain? Simplify and state any restrictions on varibles
x2-16
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x2+3x-4

the x with the 2 beside it is squared

thank you