exam Maths Puzzle Numerical Ability

please show how you find the distance and midpoint of the following set of points:
(2,radical 3) and (-3, radical 27)

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exam Other Question

The perimeter of a rectangle is 36cm. Its area is 72cm^2. Find the dimensions of the rectangle.

Thank you for your time!
How do u do this question: Solve for "r" in the formula: S=L-rL