What are /r/kumonmaths' favorite Products & Services?

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I don't have the solution book but you can send me a screenshot of the problem and I'll try to walk you through the problem.

Additionally, there is this link that can help you out in any math area such as Algebra, Calculus, Graphing, etc: https://www.mathway.com. This site also gives out step by step answer solutions if you make an account.