exam Maths Puzzle Numerical Ability

1. ac - bc + ad - bd

2. xy - 3x - 8y + 24

3. 4x2 + 20x + 5y +xy

4. 48x2y + 20xz +12xy + 5z

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exam Other Question

Solve the following system of linear inequalities by graphing

x+2y<3
2x-3y<6

Please help on this How do you put 2n^2-4n-6=0 in to a graph or table . Round to the nearst tenth