exam Maths Puzzle Numerical Ability

Please help, test tomorrow

(2x+5)^1/2=4

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exam Other Question

Hello Everyone I just need a refresher.

List any four situations where variables can be used to replace numbers; convert each situation into an algebraic expression. solve each system:

2x- y+3z=-14
3x-2y+4z=11
5x+ y-6z=-32

i am very confused on how to solve this...please help!