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Mathematics, 20.07.2019 05:30, cece4874
āā when jeremy surveyed thirty 7th-grade students at the community pool, he found that 2/15 had not read at least one book during july. he knows there are about 200 7th-grade students in his community, so he infers that about 40 of them did not read any books in july. is that a good inference? explain.
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Answers: 2
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Mathematics, 21.06.2019 16:30, catdog2230
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Mathematics, 21.06.2019 19:50, Roshaan8039
Prove (a) cosh2(x) ā sinh2(x) = 1 and (b) 1 ā tanh 2(x) = sech 2(x). solution (a) cosh2(x) ā sinh2(x) = ex + eāx 2 2 ā 2 = e2x + 2 + eā2x 4 ā = 4 = . (b) we start with the identity proved in part (a): cosh2(x) ā sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 ā sinh2(x) cosh2(x) = 1 or 1 ā tanh 2(x) = .
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āā when jeremy surveyed thirty 7th-grade students at the community pool, he found that 2/15 had not...
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