Arrange Four 9's

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?




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If nine thousand, nine hundred nine dollars is written as $9,909,
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Can you solve the below algebraic mathematical equation?

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In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.