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OpenStudy (anonymous):
I do not understand this question: "Show that the check digit \(x_{10}\) in an ISBN \(x_1x_2...x_{10}\) can be computed from the congruence \(x_{10}\equiv\sum_{i=1}^{9}ix_i\mod11\)." I have no clue what it is asking me to do. Is it asking me to give a specific example?
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