"Combinations" isn't really the right word, because a combination doesn't take order of elements into account, and the outcome of a race certainly does depend on order. "Permutations" would be the correct term.
If 4 students are competing, then the race has
4! = 4 • 3 • 2 • 1 = 24
possible outcomes.
Answer:
39
Step-by-step explanation:
Y/x=k
when y=9, then x= -3
9/-3=-3
⇒ k= -3
Answer:
r=-7
Step-by-step explanation:
Your answer is 98. Is there a multiple choice?