g At the optimal quantity of a public good: A. marginal benefit exceeds marginal cost by the greatest amount. B. total benefit equals total cost. C. marginal benefit equals marginal cost. D. marginal benefit is zero.

C. marginal benefit equals marginal cost.

Explanation:

As is the case in the private sector , the optimal quantity of a public good is the quantity where Marginal benefit (revenue in private) equals marginal cost.

This is the optimal quantity because any quantity made that is more than this will result in marginal cost being greater than marginal benefit. This is therefore the highest quantity that can be produced without costs exceeding benefits so it is optimal.

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x=3

step-by-step explanation:

this is really simple i saw that there was only one term (5x) and thought if that was 15 what would i have to multiply everything else to get it there? well if 5x became 15 then x would have to be 3 so plug the 3 in the x for the other equations and you get 15 for the other ones. so there you go. : )