exam Maths Puzzle Numerical Ability

What is X if logvx(16)=-2
**the v is the opposite of ^***

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exam Other Question

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

Thank you
57.59 divided by 4.6 ( to 2 decimal places)
Thank you for the help!!!!
From Precious