Hello!

This is my final year in high-school so I think I may find this forum handy, get ready to be annoyed at me due to uber use of the forums.

I have a question to begin.

**A travel agency calculates the expense E of organising a holiday per person in a group of x people as E = 200 + 400x. The cost C for each person taking a holiday is C = 900 - 100x. Show that the profit to the travel agency on a holiday with a group of x people is given by P = 700x - 500x^2.**
I am hitting my head writing this, it seems real easy but for some strange reason I can't get it out.

Also, could someone please point me to some documentation of that fancy maths coding thats around, it is annoying having to type x^2, etc.

Anyway, thanks very much in advance.

Kind regards,

Nick