1. The problem statement, all variables and given/known data solve. .2y^3 + .6y^3 - .5y^3 I believe the answer to be .3y^3 2. Relevant equations 3. The attempt at a solution i got the answer to be .8y^3 - .5y^3 = .3y^3 I think this is correct, I'm not sure, please let me know if I finished this correctly.