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Unformatted text preview: Distinguish the case when d=b^2-4*a*c is positive, negative and zero. (Do not use roots command. Write a code from scratch.) 3. Develop an M-file that returns a letter grade given a numeric grade x according to: (A, B, C, D, F) for (90 <= x <= 100, 80 <= x <90, 70 <= x < 80, 60 <= x < 70, x <60)....
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- Spring '10