book Maths Puzzle Numerical Ability

Simplify (3x^2y) sqrt4x^4y^6.

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book Other Question

I need help understanding how to write a function in linear equation form. For example, I need to write something to describe "the number of cases handled per person is a function How do I solve

x +3y -6z =7
2x -y +z =1
x +2y + 2z =1

Thanks,
Tijuana