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10.

In Exercises 11–14 find using Theorem 2.1.2.
11.

12.

13.

14.
     Let

15.

         (a) Evaluate using Theorem 2.1.2.
         (b) Evaluate using the method of Example 4 in Section 1.5.
         (c) Which method involves less computation?
In Exercises 16–21 solve by Cramer's rule, where it applies.
16.
17.

18.
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