exam Maths Puzzle Numerical Ability

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9x^2 + 12xy + 4y^2 - 25

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exam Other Question

If the diameter of a circle is 1.3x10^-12 meters, then what is its radus? i have been trying to solve the following problem, but have not been successful at doing so. I need help!!! Please

square root of 6 divided by 4 nth root of 36. Thanks