To determine the change in temperature from 9 a.m. to noon, we can use the formula for change in temperature:
\[ \text{Change in temperature} = \text{Final temperature} - \text{Initial temperature} \]
In this case, the initial temperature at 9 a.m. is \(-5.8\) degrees Celsius, and the final temperature at noon is \(-1.6\) degrees Celsius. We can set up the equation as follows:
\[ \text{Change in temperature} = -1.6 - (-5.8) \]
Now we simplify the equation:
\[ \text{Change in temperature} = -1.6 + 5.8 \] \[ \text{Change in temperature} = 4.2 \]
Thus, the change in temperature during these three hours is \(4.2\) degrees Celsius.
Explanation
The result indicates that the temperature increased by \(4.2\) degrees Celsius from 9 a.m. to noon. This means that it went from a cold \(-5.8\) degrees Celsius in the morning to a less cold \(-1.6\) degrees Celsius at noon, reflecting a warming trend in the air temperature during this period.