Add: (4a." + 6a2 - 10a - 4) + (6a + a² + a + 7)

H²+10h=-21 solve quadratic trinomials

Word problem for 10n=420

What makes 84 cents?

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What is 304,800,400 in expanded form?

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A math teacher gave her class two tests. 76% of the class passed the first test. 58% of the class passed both tests. What is the approximate probability that a student who passed the second test, given that he passed the first test.

What is 75% of 420 minutes?