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

Solve each of the following systems by addition. If a unique solution does not exist, state
whether the system is inconsistent or dependent.

2x+3y =1
5x+3y=16 3x+4y=17
6y-2x=-20

Im stuck.