Final answer:
The correct expression for the number of bushels Timmy now has after selling 10 and receiving 4y bushels is 'x - 10 + 4y', option a.
Step-by-step explanation:
The student's question is about expressing the number of bushels of apples that Timmy now has after conducting two separate actions: selling a certain amount and receiving a shipment. Initially, Timmy had x bushels of apples. He sells 10 bushels, which mathematically is represented by subtracting 10 from x, resulting in x - 10. Then, Timmy receives a shipment of 4y bushels of apples. We add this amount to the remaining apples Timmy has, leading to the expression x - 10 + 4y.
This expression represents the activity of adding and subtracting quantities to the initial amount of apples Timmy has. To recap the operations: we subtract 10 for the bushels sold and add 4y for the ones received. So, the correct choice that represents the number of bushels Timmy now has is: a. x - 10 + 4y.