Answer: Option C
, 
Step-by-step explanation:
If the lines m and n are parallel then the large triangle and the small triangle are similar triangles, because they have equal angles.
By definition for similar triangles it is satisfied that if they have sides of length a, b, c and a ', b' and c 'then:

In this case

So:




Therefore
if
and
then 
Finally
, 
Answer:

Step-by-step explanation:
9,09
- 0,1
____
8,99
Line up the decimals CORRECTLY as so, and you will arrive at this answer.
I am joyous to assist you anytime.
Eighty-one thousand two hundred seventy-one.
Sorry bro but it makes no sense