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Unformatted text preview: the investment doubles? (Use log or ln to ﬁnd the answer). Math 111I Sec 001 Quiz 7 Solutions Solutions. We want to ﬁnd the value of t that gives us 2 times our initial investment. Well the initial investment is $5500, and twice that is $11000. So we want to ﬁnd t such that V ( t ) = 11000. Now that is the same thing as saying solve the equation 11000 = 5500 e . 06 t for t. So our solution follows as 11000 = 5500 e . 06 t 11000 5500 = e . 06 t 2 = e . 06 t ln(2) = ln( e . 06 t ) ln(2) = 0 . 06 t ln(2) . 06 = t ≈ 11 . 55 4. Solve the equation for t 45 e. 17 t = 25 . Solutions. The solution is given by the following computation. 45 e. 17 t = 25 e. 17 t = 25 45 ln( e. 17 t ) = ln ± 5 9 ². 17 t = ln ± 5 9 ² t = ln ( 5 9 ). 17 ≈ 3 . 458...
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 Fall '08
 HITCHCOCK
 Math, Englishlanguage films, Natural logarithm, Logarithm, Slide rule

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