1. Calculate the value of the expression $15 - 9$. The result is ___.
2. What is the value of $7 - (-3)$? The answer is ___.
3. Evaluate the expression $-9 - 4$. The result is ___.
4. Which expression is the same as $-3 - (-8)$?
5. Using the rule for subtracting integers, find the value of $-11 - (-6)$. The answer is ___.
6. Use a signed number to represent this situation: Marty grew two inches this year. The change in height is ___ inches.
7. Use a signed number to represent this situation: Your checking account is overdrawn by 100 dollars. The balance is ___ dollars.
8. Use a signed number to represent this situation: A quarterback was sacked for a loss of 8 yards. The change in yards is ___ yards.
9. Use a signed number to represent this situation: Test scores for eighth graders are up 23 points. The change in scores is ___ points.
10. Use a signed number to represent this situation: A ski resort is 2000 feet above sea level. The elevation is ___ feet.