Answer:
please send a picture so I can see
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.
A . Because one you make the ratio 80:48 you simplify (divide until you can divide anymore ).
Answer would be -4 5/12
Hope that helps.