Final answer:
The correct answer is A. Yes, +70. This means the student saved 70 dollars during the week.
Step-by-step explanation:
Based on the options provided, the correct answer is A. Yes, +70.
To determine the amount saved, we need to subtract the expenses (negative values) from the received cash flow (positive values) at the end of the week. Option A states that the amount saved is +70, which means there was a positive cash flow of 70 dollars at the end of the week.
This indicates that the student saved 70 dollars during the week.