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November 08, 2025, 05:15:28 am
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TMJ

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question?
« on: February 10, 2013, 11:47:24 pm »
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The depth D meters below sea level of a submarine after time T minutes is given by the trigonometric equation D=4cosT-4 where T greater or equal to 0. When will be the next time the submarine surfaces(D=0) it it was at the surface 3:10pm, initially?
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Mao

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Re: question?
« Reply #1 on: February 11, 2013, 01:02:51 am »
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Assuming you have the question right, the answer is 3:16PM.
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Daenerys Targaryen

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Re: question?
« Reply #2 on: February 11, 2013, 04:27:13 pm »
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Let D=0 and solve for t
having said that the let the first t that makes d=0 be 3:10pm. Then just find the next t intercept and minus the initial t from this; add these many minutes to 3:10pm
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