I don't get any of this

Answer! if you don’t mind, can you explain

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b?

Interpret the following expression (5y^2-7)^3/(2y)^2