Symbolab Math Solver Step by step calculations This is a pay for app that is worth the investment.

fxSolver fxSolver is an free online math solver, equation library, graphing calculator and science/engineering problem helper. To get started, add some formulas, fill in any input variables and press "Solve.“

Microsoft Math A free app to help with school math problems

Mathway Mathway is a freemium math solving app that helps you find the solutions to any math problem you can imagine.

Photomath Photomath is a mobile app that will give you the ability to test your equations through a simple calculator interface that will fully explain the solution in a step-by-step fashion. Read more about Photomath

WolframAlpha WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels. 

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