What is the output of the function f(p)=3p-2 when the input is 2

Ineed i do not understand i'm only 8

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.

How do i put 3(x+7) in distributive property