exam Maths Puzzle Numerical Ability

Perform the indicated operation and simplify: Ok so not sure about this one. Not even sure to put a square root symbol in this box.

-3 square root 54 + 7 square root 24

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exam Other Question

Please help me with this question, I am not sure what strategy to use to find the answer. Thank you!!

Find two prime numbers that, if multiplied, would generate a 400-digit num what is the the square root of 28n squared?