I can't see the photo ....
N-9=14
that's just an example. what it equals to can be anything really
Answer:
Average change in temperature each day = 5 degrees/day
Step-by-step explanation:

The Multiplication Property of Zero.
It states "the product of any number and zero is zero". Even if there are more than one multiplier - it is still 0.
So 5 x 0 = 0
100 x 0 = 0
41 x 0 x 3 = 0
etc.