exam Maths Puzzle Numerical Ability

the perimeter of a square mirror is 80cm. what is the area of the mirror (in square cm)

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exam Other Question

Can anybody help me do the graph on this probem?
I am lost.
I need to graph the inequality for:

y >= -4
Thank you,
Jamie Two points P and Q lie on opposite sides of a line L. Find on L the point A for which the difference AP-AQ is the largest. Show the proof.