The gcf of 100 and 20 would be 5. hopefully that's right, and that this helped.
Where the pictures of the graph
The answer is C) 10x + 330 ≤ 600.
We use the ≤ since you are allowed to use the 600th minute.
When we subtract 330 from both sides, it makes a bit more sense
10x ≤ 270
270 is the number of minutes left your plan since you've already used 330, and you have 10 days left in the month.
Base ..............................
