<p>1) They would convert your GPA to +s and -s depending on whether or not numbers show up on your transcript. Otherwise, they don't care. But colleges like Stanford, would calculate your GPA similar to that anyway.</p>
<p>2) Most colleges have relationships with certain schools, so they know the depth/caliber of the student bodies. In addition your school sends a school report along with your application. On that is the average GPA, grading system, and your rank.</p>