book Maths Puzzle Numerical Ability

Could you please help me with the following question? A circle has a circumfreance of 2.25 what is the radius?

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book Other Question

A man dies and leaves half of his wealth to his wife. He leaves 1/7 of his wealth to his son. He leaves 2/3 of his wealth to his servant and $2,000 to his dog. How much total wealth did the man have? This question is regarding perfect square trinomials. I will tell you what my answer is, can you please tell me if I was right?

Find the perfect square trinomial whose first two