Take half of the middle coefficient.
Then square it.
-12/2 = -6
(-6)^2 = 36
c = 36
If it take some x minutes to upload some y digital photographs, it means it has an average of: x/y minutes to upload a single digital photograph. Then, to upload z photographs, you just multiply x/y by z.
Spoilers for answer:
If it take 7.2 minutes to upload 8 digital photographs, it means it has an average of: 7.2/8 = 0.9 minutes to upload a single digital photograph. This means that, by this rate, it will take 20 * 0.9 = 18 minutes to upload 20 photographs to the website.
4x-6= x+6
4x= x + 12
5x= 12
X= 12/5
X= 2.5
