The missing fraction would be

since it is exactly in the halfway between
Answer:
13x
because you would comibne like terms, so you add the 8 and 5.
The rate of change for the graph would be the last option, 35. If you follow rise over run, you end up with a rise of 35 and a run of 1, or 35/1 which simplifies to 35.
Use the cone formula:
And so:

5654866.7 / 12000 = 471,
So the answer is 471 weeks.
Hope this helps.