exam Maths Puzzle Numerical Ability

This one has driven me crazy too. Please help!!
Evaluate if possible:
3sqrt -64 and 3sqrt64 and sqrt-64 and sqrt64

Thank you

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exam Other Question
Please help me solve this equation: (x-1)/(x+2) > 0 What is X if logvx(16)=-2
**the v is the opposite of ^***