 Elementary algebra deals with numerical terms, namely constants 0, 1, 1.5, \(\pi\), variables \(x, y,\ldots\), and combinations thereof built with operations such as \(+\), \(-\), \(\times\) , \(\div\) , \(\sqrt{\phantom{x}}\), etc. to form such terms as \(x+1, x\times y\) (standardly abbreviated \(xy\)), \(x + 3y\), and \(\sqrt{x}\).