"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.
a. -7 is your answer dear.
Step-by-step explanation:
Ur complete Question is like -245/35 = -7
Answer:
21+3x
Step-by-step explanation:
Expand this:
3(7+x)
So it becomes:
21+3x
<u>Answer:
</u>
Required expression for one-eight of the sum of a number and three is 
<u>Solution:
</u>
Given that unknown value is represented by variable x.
Need to create algebraic expression for One-eight of the sum of a number and three.
Let’s first find one eight of the number that is 1/8th of x = 
Now on adding three we get

Hence required expression for one-eight of the sum of a number and three is 