exam Maths Puzzle Numerical Ability

i need help solving this:
(x-radical y-z)-(x+radical y-z)-(radical y+z-x)

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exam Other Question

Solve the following system of linear inequalities by graphing
x-2y=>4
x<=4

I am getting really confused about where to shade, can anyone help me?

Thanks The volume of a box is 2p^4 + 14p^3 + 20p^2. The height is p and the width is p + 5. What is the length?