exam Maths Puzzle Numerical Ability

What expression raised to the fourth power is 81x12y8z16?
will it be polynomials with more than one variable

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exam Other Question

-1/3x+y=1 solve for y

-1/3x+y=1 solve for x
Let f(x) = -x - 5 and g(x) = 2x + 3

g(0)

Help with this equation would be appreciated.