I like books by Ron Larson, particularly his Trigonometry and Applied Calculus books -- the applied calculus title (intended for social science and business majors) vs his "Calculus" book (intended for math, physics, and engineering majors) is much gentler for people seeing this material for the first time. Although I do highly recommend his Calculus book once you have the other book down.

Gelfand also has some nice texts on Algebra, Trig, and Geometry that are reasonably cheap, especially if used.

I'm older and went back to school later in life to study math, and these are the books I learned that material (for the first time -- I flunked math thru high school) from.

Here are the exact titles and ISBN-10s:

Ron Larson, Calculus: An Applied Approach, ISBN: 0618218696

Ron Larson, Trigonometry, ISBN: 1133954332

Israel Gelfand, Trigonometry, ISBN: 0817639144

Israel Gelfand, Geometry, ISBN:1071602977

Israel Gelfand, Algebra, ISBN: 0817636773

And as others have mentioned, Khan Academy is pretty good, although I tend to prefer patrickJMT's explanations a bit more: http://patrickjmt.com/