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Unformatted text preview: 1 8 above the vertex. Thus we see that 4 a = 8, and a = 2. So we have that our function is f ( x ) = 2 x 2 . 4. Upon retirement, you begin to receive money from a retirement account. The function M ( t ) = 970 , 000 e. 14 t , gives the amount of money remaining in the account, M ( t ), after t years of retirement. How many years of retirement before the account balance reaches $78,000? Solutions. We want to know how many years passed for M ( t ) = 78000. So we solve the following equation 78000 = 970000 e. 14 t 78000 970000 = e. 14 t ln 78 970 = ln ( e. 14 t ) ln 78 970 =. 14 t ln ( 78 970 ). 14 = t So we see that t 18 . 00...
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 Fall '08
 HITCHCOCK
 Math

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