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You can learn anything (and solve anything!). Of course, if you have any trouble, feel free to leave another question and we'll try to help as best as we can. In my experience, Khan Academy will usually have everything you need, sometimes requiring some quick searches. If you ever need to find a skill, give it a quick search on KA and you should be able to find it with ease. I believe the Khan Academy course has everything, with the Trigonometry and Statistics & Probability skills placed in their own sections, and Matrices in the Pre-calculus course.
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As far as I'm concerned, the Khan Academy course has everything integral to an Algebra 2 course, so you should be able to find nearly everything you need. That is a good question, one that I think should be clarified and made clearly visible.
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