Results 1 to 3 of 3

Math Help - Check Answers please (Exponential Functions)

  1. #1
    Newbie
    Joined
    Jul 2010
    Posts
    2

    Check Answers please (Exponential Functions)

    Question:

    The population of the state of New New York is given by an exponential function R=R(b) which has the formula
    R = 15 * 1.08^b
    R is measured in millions, b is time measured in years since 1990.

    1. What is the population in 1990?
    R(0) = 15 million

    2. What is the yearly growth factor for R?
    \begin{array}{|c|c|c|c|} 0 & 1 & 2 & 3\\<br />
\hline<br />
15&16.2&17.49&18.89\\<br />
\end{array}

    The yearly growth factor is 1.08. ( 16.2/15 = 1.08 & 17.49/16.2 = 1.08)

    3. What is yearly percentage growth rate for R?
    Growth Rate is 1.08; yearly growth percentage is 1.08 - 1 = .08 = 8%

    4. What is monthly percentage growth rate for R?
    Since yearly growth is .08, .08 / 12 would be .006, so about .6% per month

    Thanks in advance!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28
    All looks good, be careful of your rounding

    0 15.00
    1 16.20
    2 17.50
    3 18.90
    4 20.41
    5 22.04
    6 23.80
    7 25.71
    8 27.76
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jul 2010
    Posts
    2
    ok thanks =)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Can someone please check my answers?
    Posted in the Calculus Forum
    Replies: 0
    Last Post: February 2nd 2010, 09:19 AM
  2. Can someone please check my answers?
    Posted in the Statistics Forum
    Replies: 3
    Last Post: October 25th 2009, 08:35 PM
  3. Exponential Functions - Check if this is right?
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: June 16th 2009, 04:26 PM
  4. help me check my answers.
    Posted in the Statistics Forum
    Replies: 1
    Last Post: March 23rd 2009, 04:03 AM
  5. Check These Answers Please :)
    Posted in the Calculus Forum
    Replies: 2
    Last Post: November 6th 2008, 12:47 PM

/mathhelpforum @mathhelpforum