exam Maths Puzzle Numerical Ability

can you help me understand this problem

find an equation of the circle with center (7, -2) and radius square root of 5

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exam Other Question

I have 4 numbers: 2/3, 5/8, 6, 6. I can only use those numbers and I can not make them into decimals. I need to make 24. How can I do this? Can anyone please help me solve the following?

T=2π√L/32 for L