exam Maths Puzzle Numerical Ability

Having trouble on this. Any help is appreciated.

Square root of y+9 = 1

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exam Other Question

Please help me with this proof:
You are given that M is the midpoint of OK and N is the midpoint of KL. You are also given the coordinates for K(9,12),O(0,0),and L(15,0). What are Jeanne is three times as old as Michel. The sum of their ages is 20 years. Find out their age now.