4. Which trigonometric expression is equal to cos 72°? A. cos 55° B. cos 50° C. sin 61° D. sin 18°​

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.