You calculate the number of ways that 2 people can be chosen from 10.
The formula:
n! / r! * (n-r)! =
10! / 2! * 8! =
10 * 9 * 8! / 2 * 8! =
10 * 9 / 2 =
45 handshakes
Source:
http://www.1728.org/combinat.htm
Answer:
-21k=7(-3k)................………………
31a6b5 i think if just add them but to put it in an expression you would need to perethisis the A together with the b together and the numbers together
Answer:
Foci 
Vertices:
Eccentricity, e=
Length of latus rectum=
Step-by-step explanation:
We are given that


The equation of hyperbola is along y-axis because y is positive
Compare the equation with
(Along y-axis)
We get
a=1, b=1/4





Therefore,
The coordinates of foci=
The coordinated of vertices=
Eccentricity, e=c/a

Length of latus rectum=
Length of latus rectum=
Answer:
mean= 5+10+15+20+25+30/6=20.82=21
fraction=2+9/24=11/24