Which group of numbers is listed from greatest to least

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

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.