"Advanced Mathematics: Precalculus with Discrete Mathematics and Data Analysis" by Richard G. Brown is part of the Dolciani series of math textbooks. Val reviewed it favorably on Amazon http://www.amazon.com/McDougal-Littell-Advanced-Math-Student/dp/0618250379/ref=cm_rdp_product . It has both computational exercises and more difficult exercises which ask you to prove things.


"To see what is in front of one's nose needs a constant struggle." - George Orwell