Common factors of 12 and 24 include 2,3,4,6, and 12
4 one coefficient and three variables
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.
12, because 4 rows and 3 sections in each
4x3=12
Because the inequality is less then or equal two the lines need to be solid, not dotted.
Also the less than would put the solution to the outside of the lines.
The correct graph is Stan.
Answer: the incorrect graph is Lee because he used dotted lines and has the solution on the wrong side of the lines