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Feedback refers to a core concept in circuit design and control theory, used to stabilize amplifiers and control system ...

This profile has not been claimed by the company. See reviews below to learn more or submit your own review. H&R Block is a tax preparation and financial services company that has been providing its ...

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Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Vikki Velasquez is a researcher and writer ...