Answer:
it's a) 7a/20b
Step-by-step explanation:

1) neither. that’s not one of your answer choices so just pick one (maybe odd ♀️)
2) 2 is the answer. Plug in 1 for x, raise everything to its power (which will end up being 1), then use PEMDAS to solve
5/6 is closest to 1 because it it 1/6 away from 1 and is 5/6 away from 0 and is 2/6 away from 1/2 (referring 1/2 as 3/6) Hope this helps!