I need help with this :)

Answer:
1. -13 degrees
2. $12
3. 6 yards
4. 15 points
Step-by-step explanation:
1. -5 - 8 = -13
2. $100 - $88 = $12
3. 13 - 7 = 6
4. 10 x 2 = 20 - 5 = 15