I think the answer is 31.2 miles per gallon
Well there is 24 hours in a day so 24 - 15 = 9. So he spends 9 hours awake.
A(b-c)
First substitute values
-8(12+4)=
Next, solve using ordering of PEMDAS
-8 (12+4)=
-8 (16)=12
The average rate of change is m=5.
Hope this helped.
I would think it to be A because 8/12 can be simplified into 3/4
