Answer:
D. 
Step-by-step explanation:
Determine the groups: 
- 
Factor out terms:
The -2 was factored out in the second group to ensure that both groups had
(x-12).
- I’m assuming the expression implies the following:
(1-n)/(n^2 - 1)
The steps goes as follows:
= -(n-1)/(n^2-1) (factored a negative out)
= -(n-1)/[(n+1)(n-1)] (Factored denominator into a difference of squares, but don’t just blindly accept the fact, expand it and you should get the original denominator)
At this point, the (n-1) terms cancel, as you should know: a real number, besides 0, over itself is 1.
= -1/(n+1) , which is the answer
Note: You could also see it as 1/-(n+1) or 1/(-n-1)
29.
You have 11 for those who only ran and 18 for those who ran and stretched.
The answer is D. 15+18+12+5= 50 and there are 5 ramblers
