Final answer:
The expression representing the current price of milk after a series of price changes is D. $2.55 + y, calculated by adding the initial price with the increases and subtracting the decreases.
Step-by-step explanation:
The student's question asks about the current price of milk after a series of price changes. Starting with an original price of $2.65, the price first rises by an unknown amount y dollars due to the hurricane. After that, there is a decrease of $0.15, followed by an increase of $0.05. To calculate the current price, the following expression is formed: Original Price + Increase - Decrease + Subsequent Increase, which is $2.65 + y - $0.15 + $0.05.
Performing the arithmetic which combines the constant values gives us $2.65 - $0.15 + $0.05 = $2.55. As a result, the expression that represents the current price of milk is $2.55 + y. Hence, the answer is D. $2.55 + y.