The market for orchids is in equilibrium. If the price of orchids decreases from $10.00 to $5.00, then we would expect to see a/an increase in supply. increase in quantity supplied. decrease in supply. decrease in quantity supplied. surplus in the market.

Decrease in quantity supplied.

Explanation:

As in the given question the price of orchids  is decreases from $10.00 to the $5.00 it simply means the purchasing of orchids by customer is not very high it means only few people or customer are purchasing the orchids it directly effect the quantity supplied. So the decrease in the quantity supplied takes place

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answer: marginal utility of the fourth brownie is 0.

explanation: marginal utility is the addtional utility gained from the consumption of one more unit of a good. it is given by,

so, marginal utility at the 4th unit will be given by

since, the values are not given here, you can simply find marginal utility at fourth unit by subtracting total utility at 3rd unit from total utility at 4th unit.