Quiz07

Quiz07 - 0.12 100 t m t e-= a How many grams are there...

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Math 115 Fall 2007 Quiz #7 Sections 4.3 – 4.5 Name _______________________________________ RUID# _______________________ Recitation Section: _14 | 15 | 16___________ All work must be shown in the problems below in order to receive full credit. Credit may not be given for unsupported work. Please clearly highlight all final answers. #1 (5 points): Solve the following logarithmic equation for x: 2log log 2 log(3 4) x x = + - #2 (4 points) A radioactive substance decays in such a way that the mass in grams remaining after t days is given by the function
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Unformatted text preview: 0.12 ( ) 100 t m t e-= a) How many grams are there originally? b) How many grams remain after 20 days? #3 (6 points) In 2006, the estimated U.S. population reached 300 million. The population passed 200 million in 1967. a) Use the exponential growth model to find the estimated rate of population growth during 1967-2006. Express as a percent rounded to 2 decimal places. b) If the population continues to grow at this same rate, in what year will the population reach 500 million?...
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