Can somebody please help?!

Find the values of y: 3y^3(y^2+ 2/3y)=0

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3