exam Maths Puzzle Numerical Ability

Simplify

c-1 power + d -4 power (Add. Write the answer with all exponents positive)

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exam Other Question

3y +7 > 22 Please explain how the equation of the radius of a circumscribing circle which is "'a' square root of three divided by 3" ,where 'a' is a side of the inscribed equilateral triangle