exam Maths Puzzle Numerical Ability

The edge of a 4-meter long ladder is 3.5 meters from the base of a building. Will the top of the ladder reach a window that is 3.8 meters from the ground? Can you also explain it?

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exam Other Question

If f(x)=a(x-2)2 +3, is the function whose graph contains the point (4,9), find a. I answered 4/9. Is that correct? Please work so I can see. Thanks What is the square root of 20 over the square root of 15 in a simplified expression?