The question is asking how many combinations of two people can be made from a group of ten people.
Using the formula C(10,2) = 10!/(2! x (10 - 2)! = 10!/(2! x 8!) = 45 handshakes.
A simple way to prove this is each person shakes the hand of 9 other people
10 x 9 = 90 but this counts every handshake from the view of both people involved.
The actual number of handshakes is therefore 90 / 2 = 45
Answer:
-2
Step-by-step explanation:
The expression that is equivalent to 100n^2-1 is A. (10n)^2-(1)^2 because anything equates to 1 is 1
Answer:
I believe that the answer is A (3,-2)
Answer: 150 miles
Step-by-step explanation:
45 x
--- = ---
.75 2.5
solve for x using a proportion (2.5)(45)/(.75)
x=150