at a weather centre the temperature at midnight was -21°C. by noon the next day it had risen to -4°C. by how many had the temperature risen?
and explain the answer, thank youu-
-4 - (-21) = 17
To find out how much the temperature had risen, we need to subtract the initial temperature from the final temperature.
The initial temperature at midnight was -21°C, and by noon, it had risen to -4°C.
To find the rise in temperature, we subtract the initial temperature from the final temperature:
Rise in temperature = Final temperature - Initial temperature
Rise in temperature = -4°C - (-21°C)
To simplify the subtraction, we can change the double negative to a positive:
Rise in temperature = -4°C + 21°C
Now, adding the temperatures, we get:
Rise in temperature = 17°C
Therefore, the temperature had risen by 17°C.
To find the temperature rise, we need to subtract the temperature at midnight (-21°C) from the temperature at noon (-4°C).
Temperature rise = Temperature at noon - Temperature at midnight
Temperature rise = (-4°C) - (-21°C)
To subtract a negative number, we can change the subtraction to addition and change the sign of the second number:
Temperature rise = (-4°C) + (21°C)
Now we can perform the addition:
Temperature rise = 17°C
Therefore, the temperature had risen by 17°C from midnight to noon.