Part A: The low tempratures for a week in january in Billings, MT are listed below.
Monday- -4.50
Tuesday- -6.00
Wenesday- -9.50
Thursday- -3.25
Friday- -0.75
Saturday- -0.25
Sunday- ?
Which day in temprature was the coldest and why?

Part B: the low temprature on sunday was 3.75 degrees cooler than the low temerature on saturday. What was the temprature on sunday?