exam Maths Puzzle Numerical Ability

the length of a rectangle is (3x + 5)meters and the breadth 2x - 7).

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exam Other Question

Please help me solve the following problem:

If f(x)=4-x and {{{g(x)=1+x^2}}}, find (g X f)(-2)
The length of a rectangle is 1 cm longer than the width. If the diagonal of the rectangle is 4cm, what are the dimensions (the length and the width) of the rectangle.

Please show work.