exam Maths Puzzle Numerical Ability

what are the domains of these expressions? How do I find these domains?

1). the sqrt of 2-x
2). x-3 over x+2
3). 3x^2 +2x -8

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exam Other Question

which number is a possible solution to this equation 2x^3-4x^2+5x-14=0.
2, 3, 5, or 0
the soloution of the system of equations below

y=5-3x
4x-5y=13

how do i solve for x and y