Please help me I have a 33 in his class and I don't understand anything pls help me

Which of the following of the following sets of side lengths could not form a triangle?

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.

What expression is equivalent to (84+16)