It looks like it was most likely Rafael Bombelli in 1572, from what I can find. I've posted a related link to a Wikipedia article. Wikipedia should not be your sole source of information, but it's a starting point.
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Rene Descartes came up with the word imaginary in 1637 to describe them. It was a derogatory term. He (and many other mathematicians of that age) did not like imaginary numbers. Many people didn't believe in them, because they were not real.
The sum of numbers from 1 to 101 can be calculated using the formula for the sum of an arithmetic series, which is n/2 * (first term + last term), where n is the number of terms. In this case, the first term is 1, the last term is 101, and there are 101 terms in total. Plugging these values into the formula, we get 101/2 * (1 + 101) = 101/2 * 102 = 5151. Therefore, the sum of numbers from 1 to 101 is 5151.
Term- a number, a variable, or a product of numbers and variables.
The set of real numbers.
Composite numbers are the numbers that have more than two factors.