book Maths Puzzle Numerical Ability

a side of a square has length x. write and expression for the differance between the area and perimeter of the square.

Mary's age is m. sue is three years less than twice mary

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There is a company that makes rectangular shaped birdcages with height "c" inches and square bottoms. The volume of these cages is given by the function: V = c^3 - 6c^2 + 9c

Wh is any one out their that can help me with this problem a.s.a.p i would really apprecate it. translate the difference between twelve times a number and the number into a mathematic