exam Maths Puzzle Numerical Ability

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

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exam Other Question

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

is it (0, 1, -2)?? 13/12 x + 1/12 x = 9x+ 1/6 + 11/12 How do I work this problem to obtain the right answer ?13 is at the top and 12 is on bottom as 1 over 2 and 1 over 6 and 11 over 12. Thanks for your help and how to work the problem.