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Bell industries estimated its total cost to be curvilinear funxtion of produxtoon volume(x). this total cost...

Bell industries estimated its total cost to be curvilinear funxtion of produxtoon volume(x). this total cost function follows. TC=50+80x-60x2+.25x^3
why is this considered a short run cost function?
what is the marginal cost funtion of bell company?
what is the average variable cost funtion for bell company?

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