I simply took the expression and put it into mathimatical form. Eight = 8. More than implies to addition. Product implies to multiplication, two and a number implies to 2 x n. N stands for number.
-4.2 degrees. What you would do is from 8-12 (midnight) is 4 hours. So it dropped -16.8 degrees in those 4 hours so -16.8 / 4 is -4.2 degrees. So it dropped -4.2 degrees every hour but it was also -4.2 degrees at 9:00 p.m.
