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159E3-F2009 - MA 15900 1 Find the exact value of cos 9 4...

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MA 15900 EXAM 3 FALL 2009 1 1. Find the exact value of cos 9 π 4 . 1) 3 1 2) 1 3 3) 1 3 1 4) 1 3 1 5) 2 6) 2 7) 2 2 8) 2 2 9) None of the above 2. Solve the following equation. log 3 ( x + 2) + log 3 x = log 3 15 1) x = 15 7 2) x = 1 7 3) x = 15 7 , 1 7 4) x = 3 2 5) x = 13 2 6) x = 3 2 , 13 2 7) x = 5 8) x = 3 9) x = 5,3 3. After an amount of a drug is injected into a body, the drug is then eliminated from the body over time. Suppose that for an initial dose of 20 milligrams, the amount A ( t ) in the body t hours later is given by A ( t ) = 20(0.7) t . After 3 hours have passed since the injection, what percentage of the initial dose will have been eliminated ? 1) 6.86% 2) 10% 3) 14% 4) 34.3% 5) 65.7% 6) 86% 7) 90% 8) 93.1% 9) None of the above
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