Because the browser is not designed for mathematics. foe example, it does not support some symbols. Punctuation is not allowed in questions which means that it is not possible to show brackets, which can create ambiguity in questions. Powers are not displayed properly, etc.
you cant
it cant talk
you cant by the makers of wikianswers
you cant solve but you can simplify -55x
you cant.
it can give you the right questions.
Maybe your computer doesn't have the right software.
your security code is only known to you so it cant match because wikianswers doesnt know.
he cant
you cant solve that YOU FREAK!
you cant with the information that you gave
you cant!