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please do both parts in 15 minutes please urgently and give only final answer no need to explain... I'll give you up thumb definitely

Q 6

4. For the cost function C (Q) = 1000+ 14Q +9Q2 + 30%, what is the marginal cost of producing the fourth unit of output? O $295 O $116 O $42 $230 6. Economies of scale exist whenever: O average total costs increase as output increases and average total costs are stationary as output increases. O average total costs decline as output increases. O average total costs increase as output increases 6. Economies of scale exist whenever: O average total costs increase as output increases and average total costs are stationary as output increases. average total costs decline as output increases. O average total costs increase as output increases. O average total costs are stationary as output increases