Do problems ## 1,3 on page 174.

Do problem #4 on page 174.  Try to do what I did with mod 5 computations
in class.  Start with the computation of the order of [2] and then use
Proposition 3 (page 173) to get all other orders.

Do ## 13,14 on page 175.

Do ## 19,20 on page 177.

Do ## 21,22,23,25 on page 178.

Do #40 on page 181.

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The quiz on Friday will be on orders of elements in Z/mZ, such as the formula from
Proposition 3, and Fermat's Theorem.  Euler's Theorem will not be needed.