U will get 15 points pls help

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Are the corresponding angles congruent? explain why or why not.

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?