book Maths Puzzle Numerical Ability

what calculation do i need to find the diagonal of a rectangle
e.g.5metres long by 4 metres wide?

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book Other Question

If the total charge including 6.50% tax is 17,883.77, then how much is the original charge before the 6.50% tax? It seems that whenever I try to work this out, I end up with 6.50% What describes the number and type of roots of the equation 4x^3 - 6x^2 + 15x + 2= 0?