1.

If 31z5 is a multiple of 9, where z is a digit, what is the value of z? You will find that there are two answers for the last problem. Why is this so?

Answer»

If 31z5 is a
multiple of 9, where z is a digit, what is the value of z?


You
will find that there are two answers for the last problem. Why is
this so?



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