Hello There!
The temperature at 10 am in the morning was 1 degree below zero.
First, we know at 8 am that the temperature was 3 degrees below zero so that number is -3 and it’s our starting number.
Next, it says an hour later the temperature has gone up 6 degrees so we have -3 + 6 and we get a sum of positive 3.
Finally, at 9 am the temperature dropped again but this time 4 degrees so 3 - 4 = -1
The temperature at 10 am in the morning was 1 degree below zero.