Results 1 to 2 of 2

Math Help - exponential functions

  1. #1
    Member
    Joined
    Nov 2007
    Posts
    112

    exponential functions

    (a) Niki invested $7000 in the stock market. The investment was a loser, declining in value 11% per year each year for ten years. How much was the investment worth after 10 years?


    (b) After ten years, the stock began to gain value at 11% per year. After how long will the investment regain its initial value of $7000? Give your answer to the nearest tenth.


    I need some help on how to go about this problem, i think the right equation is Q=Qoe^(-kt)...some help

    mathlete
    Follow Math Help Forum on Facebook and Google+

  2. #2
    GAMMA Mathematics
    colby2152's Avatar
    Joined
    Nov 2007
    From
    Alexandria, VA
    Posts
    1,172
    Awards
    1
    Quote Originally Posted by mathlete View Post
    (a) Niki invested $7000 in the stock market. The investment was a loser, declining in value 11% per year each year for ten years. How much was the investment worth after 10 years?
    Nothing using e here:

    7000(1-0.11)^{10}=A

    Quote Originally Posted by mathlete View Post
    (b) After ten years, the stock began to gain value at 11% per year. After how long will the investment regain its initial value of $7000? Give your answer to the nearest tenth.
    A(1.11)^n=7000

    Solve for A in the first problem, and then use that to solve for n in the second.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: June 9th 2011, 10:54 AM
  2. log and exponential functions
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: May 3rd 2009, 04:27 PM
  3. Exponential Functions
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: October 16th 2008, 10:28 PM
  4. Exponential Functions...
    Posted in the Pre-Calculus Forum
    Replies: 8
    Last Post: August 26th 2008, 10:51 AM
  5. exponential functions
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: March 25th 2008, 09:55 AM

Search Tags


/mathhelpforum @mathhelpforum