To analyze Bob's money situation:
- Bob earned $25 from doing yard work.
- He owed his dad $30 for the iPad case.
To find out how much money Bob has after accounting for his earnings and what he owes, we can express it as follows:
Money after earning:
Bob starts with $0, earns $25 (which can be seen as +25).
Bob's debt is -30. Therefore, the calculation would be:
\[ 0 + 25 - 30 = -5 \]
This means that after earning the money and considering his debt, Bob has -$5, meaning he still owes $5 after the transaction.
Thus, the appropriate expression and answer according to the options provided would be:
Rational answer: Bob still owes money in the end: -30 + 25 = -$5.