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  1. G

    expected grade boundries for As math p12

    Sorry, I meant that CD was (8 4 -8), not OC.
  2. G

    expected grade boundries for As math p12

    No, OD was (12, 9,-2). For CD, you had to consider the vector in the direction of BA, not AB. Hence, OC was (8 4 -8) and you add up OC and CD to get the position vector of OD.
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