D would make the most sense they did have gold and salt mines in North Africa.
The correct answer is: "He developed mathematical principles"
René Descartes (1596 – 1650) was a French philosopher, mathematician, and scientist who lived more than 20 years in the Dutch Republic and was one of the main figures of the Dutch Golden Age.
His great influence in mathematics has been his major contribution to the Scientific Revolution, although his work in philosophy is outstanding too. He developed the the Cartesian system of coordinates. He is considered the father of analytical geometry, which connects both algebra and geometry and which has been used in the development of infinitesimal analysis and calculus .
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<span>the employment of immigration labor tended to drive down workers wages.</span>
It introduced a successful labor model in which employees were housed near the factories where all steps of manufacturing were completed
