exam Maths Puzzle Numerical Ability

Explain or show how you could use a grid paper to draw a retangle with a perimeter of 18 units.

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How do I solve n(n-6) >= -4
Could someone help me solve these? I have to graph the inequality and show the graph, your help is greatly appreciated.
1) 4x+y7-8
2)x+4y, less than or equal to 4
3)9x+y<7