I would go with D.
Try drawing it out. When you do you realize that y=6 is a horizontal line and x=? would have to be a vertical line because a line that it x= anything is a vertical. Because we are not given the "?" the slope is undefined.
If the sum of the first and last is 64, their average is 32. They will have a difference of 6, so the first number is 29 and the last is 35. The numbers are therefore 29, 31, 33, 35.
Answer:24
Step-by-step explanation:
