Please help me thank you

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.

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

3.4a=57.8 what is the the value of a