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The expression for the total expenditure is:
Total expenditure = Price * Quantity
Price comes from the supply curve:
Price = 14 + 5Q
The total expenditure is then:
Total expenditure = (14 + 5Q) * Q = 14Q + 5Q^2
The marginal expenditure curve is then the derivative of the total expenditure:
Marginal expenditure = (d/dQ)(14Q + 5Q^2) = 14 + 10Q
Solution: 3) ME=14+10Q
Please feel free to ask if you have any additional questions about this solution.