On a given morning the temperature was 81°F. The temperature dropped 9°F and then rose 5°F. How much does the temperature need to rise or fall to return to the initial temperature of 81°F?(1 point)
Responses

Rise 4°
4
°
Rise 4 degrees

Rise 9°
9
°
Rise 9 degrees

Fall 4°
°
Fall 4degree

Fall 5°
5
°
Fall 5 degrees
The temperature dropped by 9°F and then rose by 5°F. To return to the initial temperature of 81°F, it needs to rise by 4°F.
To return to the initial temperature of 81°F, we need to determine the net change in temperature after the initial drop of 9°F and subsequent rise of 5°F.
Step 1: Start with the initial temperature of 81°F.
Step 2: Subtract the temperature drop of 9°F: 81°F - 9°F = 72°F.
Step 3: Add the temperature rise of 5°F to the result of step 2: 72°F + 5°F = 77°F.
Therefore, the temperature needs to rise 4°F to return to the initial temperature of 81°F.
To find out how much the temperature needs to rise or fall to return to the initial temperature of 81°F, we need to calculate the net change in temperature.
Given that the temperature dropped 9°F and then rose 5°F, we can compute the net change by subtracting the second change from the first change: -9°F + 5°F = -4°F.
Therefore, the temperature needs to rise by 4°F in order to return to the initial temperature of 81°F. So, the correct response is "Rise 4°".