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A correct calculation can answer the wrong model - Online practice 1
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
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Fictional cost model: one fixed fee 5 units plus 2 units per whole item, C=5+2n, n a non-negative integer. Compare orders of 3 and 6 items. A recorded order of 3 items cost 13 units. Check arithmetic before deciding whether the model fits.
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