Looks good! You have the right answers.
However, the graph for 12 and 15 is inaccurate! Because he starts from a stop sign/stop light, the graph's speed should start from the origin!
Not to confuse you or anything, but this means the graph does not follow the description of the problem. Please let your teacher know so s/he can fix the worksheet.
Answer:

Step-by-step explanation:
Given:

Add 3 to both sides

Divide both sides by 3 to get x alone

Hope this is helpful
Answer: an=50(1/5) ^n-1
Step-by-step explanation:
So for that it will be 382+618 is equal to or better than 1000
I think so