Answer: A; automobiles
Step-by-step explanation:
According to the United States Environmental Protection Agency, automobiles constitutes the major cause of air pollution in the country. Automobiles accounts for more than half of the total air pollution in the United States.
Let's see what factors do the numbers have
do the nominator and nominator have any factors in common? no! then it can't be simplified!
-61 + (-143) = -204
Add them both, I suppose.
Answer: You can put any number in a/b because 100 is at least greater!
Step-by-step explanation:
Hope this helps, if not... good luck!