13. To the right is the graph of y = f(x), which is the volume of a box with a top. The box is made from a piece of cardboard 20 cm long and 12 cm wide. Squares of side length x centimetres 160 80- are cut from the corners of the cardboard to make a net for the box. 4. 12 -80- Which statements are correct? -160 i) The minimum volume is approximately 65 cm'. ii) The maximum volume is approximately 131 cm'. iii) The volume is 0 when x is approximately 8.2 cm. iv) The maximum volume occurs when x is approximately 2.4 cm.

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