Answer:
C.
Step-by-step explanation:
use the pythogorean theorem a^2 + b^2 = c^2
Answer:

Step-by-step explanation:
1st you want to find a common denominator. which is 8.
2nd change
to 
3rd you add
and
together an you get 
The variable was whether people approve or disapprove of the president. They were trying to poll just the people that live in the main part of the USA. There is slight bias that comes from excluding Alaska and Hawaii.
Make it better can't read it sorry