exam Maths Puzzle Numerical Ability

I am a Grandma in a jam! I am trying to help my grandson figure out a couple of Algebra questions and I need help!! Can someone please show me the logorithimic form of the equation:
(1/3)^-4 = 81????? Help, Please. Thank YOu!

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exam Other Question
Using Gauss-Jordan elimination- solve following system of equations.

x+y+z=2
2x-3y+z=-11
-x+2y-z=8

I think it is x= 1/3, y=10/3, z=-5/3

Am I correct?
Thanks hey. i'm having a lot of trouble with this question. if you could help me that would be great. thanks.


here it is;;


The high-school yearbook staff is deciding how many co