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Graphing the Equation to Find the Lowest Unit Cost

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I found that the unit cost of using production equip. is:
cost = 1.5x(2)[that is to the 2nd power] - 120x + 4,000

where x is the number of units produced. Draw a graph to find the lowest unit cost. what production level does this correspond to?

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Solution Summary

The expert examines graphing equations to find the lowest unit costs.

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Update:

Because you wanted the number of units and the lowest cost from the graph, I gave you the answers by locating point on
the graph, which happens to be (40, 1600).

However, if you want to get this by ...

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