A is the answer i believe
E. The 31 red marbles drawn by the student
A. The 100 marbles drawn by the student
31
When points are being reflected over the x axis you simply multiply the y value by -1. This makes the last option the correct one.
(x1,y1) = (-37,47)
(x2,y2) = (26,32)
Now, m = (47-32) / (26+37)
m = 15 / 63
m = 5/21
So, the slope would be 5/21
Hope this helps!