To find the temperature after 6 hours, we can use the following calculation:
- Starting temperature: 28 degrees
- Decrease in temperature: 5 degrees per hour for 6 hours
First, we calculate the total decrease in temperature:
\[ \text{Total decrease} = 5 \text{ degrees/hour} \times 6 \text{ hours} = 30 \text{ degrees} \]
Now, subtract the total decrease from the starting temperature:
\[ \text{Final temperature} = 28 \text{ degrees} - 30 \text{ degrees} = -2 \text{ degrees} \]
Therefore, the temperature after 6 hours would be -2 degrees.
So the correct response is -2°.