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Chegg.com has the most comprehensive library of solutions and asnwers to students' questions and very efficient Q&A service and a large number of other services. At $14.95 per month it's a bit more expensive than the others, however it's definitely worth it.
At Bartleby you get access to a large library of solutions and answers to questions. It costs $9.99 per month.
SolutionInn also provides access to a large library of solutions and answers to questions. Prices start at $9.99 per month, with free trial available.