Looking for a math type plugin

I would like to know if there is a wordpress plugin that I can use to display some math stuff. Stuff like put an equation in a blog. Let’s say for example x^2 + 4x + 5 and I can either draw the graph on a Cartesian coordinate system, or better to have the software plot the equation. Even better would be to go to the level of Calculus I + II. Does anybody know of such software.
While I am here, I would like some recommendations for the following types of plugins, forums, ad insertion, seo, security. Also I am planning on setting up on ehost, anybody have an opinion on this webhosting company?
Thanks,
Mark