A rectangle has width `w` centimetres. The area of the rectangle, `A`, in square centimetres, is `A = 2w^2 + 5w`.
The graph `A = 2w^2 + 5w` is shown.
- Explain why, in this context, the model `A = 2w^2 + 5w` only makes sense for the bold section of the graph. (1 mark)
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- The area of the rectangle is 18 cm². Calculate the perimeter of the rectangle. (2 marks)
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