<p> In the eighth grade, 1 math whiz < 1 popular boy, according to Tess's calculations. That is, until she has to factor in a few more variables, like:<br> 1 stolen test (x), <br> 3 cheaters (y), <br> and 2 best friends (z) who can't keep a secret. <br> Oh, and she can't forget the winter dance (d)! </p> <p> Then there's the suspicious guy Tess's parents know, but that's a whole different problem. </p> <p> Can Tess find the solutions? </p>