For this question the answer is A.
Mathematical models are one or more equations used to represent many common situations.
A mathematical model is a description of a system using mathematical concepts and language. The process of developing a mathematical model is termed mathematical modeling.
Mathematical models are one or more equations used to represent many common situations.
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The correct answer is letter D
Abraham Lincoln was 16th American President (1861-1865) born in Hodgenville, Kentucky, remembered as the president who emancipated slaves in the USA and considered one of the inspirers of modern democracy and one of the greatest figures in American history.