There are
ways of picking 2 of the 10 available positions for a 0. 8 positions remain.
There are
ways of picking 3 of the 8 available positions for a 1. 5 positions remain, but we're filling all of them with 2s, and there's
way of doing that.
So we have

The last expression has a more compact form in terms of the so-called multinomial coefficient,

Answer:
26.31
Step-by-step explanation:
Use distance formula
d = 
substitute in points and solve
d = 
d = 
d = 
d = 
d = 26.30589288
d = 26.31 rounded
2: 17.5 years. Work; 12 months in one year, 210 months divided by 12 months= 17.5 years.
The three points are on the same line, so the slopes formed by any of the two points stay the same
[-7-(-5)]/(-1-0)=[n-(-5)/(1-0)
(n+5)=2
n=-3