PLEASE HELP I DON'T UNDERSTAND THIS AT ALL

Step-by-step explanation:
you'll use the previous date t fine the difference ex. if yesterday was 80 degrees and today's is 84 the difference would be 4 degrees. hope this helps a bit ( I'm pretty sure this is correct also remember if you need ask teacher for help!!)
Answer:
Step-by-step explanation:
Basically you have to look at the forecast each day and find the lowest and highest tempreature that day and find the difference and subract the two numbers of the tempreature.