Find the value of x so that f(x)=7.

Simplify the expression. -2/5(10+15m-20n)

What is the result of adding the system of equations? 2x+y=4 3x-y=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.