Originally Posted by

**shepherdm1270** ok i JUST worked on it some more, and i did the table and saw that 400 is the correct answer. then i worked on the formula and got this far:

425-(x-75)(5) = price per seat

R(x) = x (425 - (x - 75)(5))

So i need to simplify it, find the derivative, and solve for x...

the algebra is where i run into problems Mr F says: Fact of life. The further you go in your mathematical studies, the more it will be expected that you can do basic algebra. If you are learning calculus (which you appear to be doing) then it's absolutely expected that you have basic algebraic competencey.