exam Maths Puzzle Numerical Ability

two-thirds of the diameter of a cirlce that is 9/16 across and 9/16?

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exam Other Question

Can you please help me with this problem? 25x^2-4/49 factor out completely or state that it is prime. Please evaluate the complex expression writing the final solution in standard form (1 +bi); (2-i)*(3+2i)
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