exam Maths Puzzle Numerical Ability

The length of a rectangle is 1cm longer than its width.
If the diagonal of the rectangle is 4cm, what are the dimensions of the rectangle?

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exam Other Question

find the slope of the line that is perpendicular to the one represented by the given equation The problem I have is l has y-intercept(0,3) and is parallel to the line with equatio How would I set up the following problem to solve correctly? Write in lowest terms and for what value(s) of x is the fraction not defined? This is in the rational expressions chapter of the book.

x^2+3x
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x^2+7x+12