Answer:
6•(-5)
Explanation:
Each hour there is a change of -5, so after:
- 1 hour: -5=1•(-5)
- 2 hours: -5+(-5)=2•(-5)
- 3 hours:-5+(-5)+(-5)=3•(-5)
- 4 hours: -5+(-5)+(-5)+(-5)=4•(-5)
- 5 hours: -5+(-5)+(-5)+(-5)+(-5)=5•(-5)
- 6 hours: -5+(-5)+(-5)+(-5)+(-5)+(-5)=6•(-5)