exam Maths Puzzle Numerical Ability

The length of a rectangle is 3 m more than twice its width. If the perimeter of the rectangle is 42 m, find the dimensions of the rectangle.

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exam Other Question

3/ x^2-4x + 3/x-4 Help! :-( I am having trouble solving this problem. It is a homework assignment due Tuesday! Thank you so very much!! Please show the steps on how to solve also. Thanks!! Rationalize the denominator:

5/(sqrt6)+(sqrt5)