Did you ever get the answer? I have pretty much the same exact one but mine said 150 skaters and I don't know how to answer it.
Answer:
Total number of people = 13
A:
Number of ways to choose 10 players to take the field = 13C10
= 
= 286
B:
This is given as: 13P10
=
= 
= 1037836800
C:
This is given as:
(3C1 x 10C9) + (3C2 x 10C8) + (3C3 x 10C7)
Solving this we get the answer as = 285
The point that is 3/7 of the way between -4 and 17 is 5
Answer: it’s B
Step-by-step explanation: Look at the graph clearly
and you will see the value of x and y