Answer:
10
Step-by-step explanation:
If the points are collinear, then that means they lie on the same line when connected to each other. In order to prove this, the distances between the points must sum up to the length of the line.
AB + BC = AC
7 + 4 ? 9
11 ≠ 9
Since they do not sum up, therefore, the points are not collinear.
Answer:
B is the correct chose
Step-by-step explanation:
To find your sale price you must:

just simply follow that operation and you're good to go