Solve this equation by using the look inside method to rewrite the problem

-81 = 3(5 - 4r)

What is the value of the expression below? (81^2)^1/8

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Tim earns $120 plus $30 for each lawn he mows. write an iniqualityvto represent how many lawns he needs to mow to make more than $310