exam Maths Puzzle Numerical Ability

solve the following system of equations using matrices
x-y+4z=6
2x+z=1
x+5y+z=-9

is it (0, 1, -2)??

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exam Other Question

As stated in textbook:

Volume of cube is v(x)=(4x-2)^3. Express v as a composite of 2 functions and explain what each function represents.

I just don't have a clue Hello I need some one to help with this solution please. Last year ralph had $5 million in operation income. there was net depreciation of $1 million and interest expense of $1mill