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Mercado Libre, Inc. (literally "free market" in Spanish, and known as Mercado Livre in Portuguese) is an Argentine company headquartered in Buenos Aires, incorporated in the United States that operates online marketplaces dedicated to e-commerce and online auctions, including mercadolibre .com.

Microsoft Corporation is an American multinational technology corporation which produces computer software, consumer electronics, personal computers, and related services. Its best-known software products are the Microsoft Windows line of operating systems, the Microsoft Office suite, and the Internet Explorer and Edge web browsers.

In algebra, the rational root theorem (or rational root test, rational zero theorem, rational zero test or p/q theorem) states a constraint on rational solutions of a polynomial equation. . Solutions of the equation are also called roots or zeroes of the polynomial on the left side. The theorem states that each rational solution x = p⁄q ...

Amazon Alexa, also known simply as Alexa, is a virtual assistant technology largely based on a Polish speech synthesiser named Ivona, bought by Amazon in 2013. It was first used in the Amazon Echo smart speaker and the Echo Dot, Echo Studio and Amazon Tap speakers developed by Amazon Lab126. It is capable of voice interaction, music playback ...