3 and 60 are the extremes while 15 and 12 are the means.
There are no given coordinates, so it's impossible to answer your question. I'm sorry.
3 because the numbers for x are all different
Answer:
lots of multiplying I've noticed
1. B
2. A
3. D
4. D
I'm not too sure about 1 but I'm sure about the others. Hope this helps!