exam Maths Puzzle Numerical Ability

Find the slope, if it exists, of the line containing the pair of points.
(-2.3,4.2) and (-1.9,3.1) the slope m=

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simplify:

sqrt72
The diagonal of a rectangle is 25 inches more than its width. The length of the rectangle is 23 inches more than its width. What is the width of the rectangle?