I'm stuck on this math problem. The answer i highlighted is wrong so that eliminates one, and i'm just so confused.

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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.