Final answer:
The expression that represents the number of quarters Ali and Tom have together is 2q + 4.
Step-by-step explanation:
To find the expression that represents the number of quarters Ali and Tom have together, we can start by writing an expression for the number of quarters Tom has. Since Tom has four more quarters than Ali, his expression would be q + 4. Now, to find the expression for the total number of quarters they have together, we simply add Ali's expression to Tom's expression. So the expression would be q + (q + 4), which simplifies to 2q + 4.