Results 1 to 4 of 4

Math Help - Exponential word problem I'm having trouble with

  1. #1
    Newbie
    Joined
    Apr 2013
    From
    Columbia, Maryland
    Posts
    4

    Exponential word problem I'm having trouble with

    1.) Jerry's daughter Marty has asked him to consider a change in her allowance. She has proposed that he pay her 2 cents this week and that he double the amount each week. It sounds good for this week but Jerry is suspicious! How much would Jerry pay in week 5? Week 15? Week 25? Week 50? Should Jerry accept this proposal?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Apr 2005
    Posts
    16,449
    Thanks
    1864

    Re: Exponential word problem I'm having trouble with

    What difficulty are you having? Do you understand that this is just arithmetic? You know how to multiply by 2, dont you? The first week would be 2 cents, the second week, 4 cents, the third week 8 cents, the fourth week 16 cents, the fifth week 32 cents.... You can continue just multiplying by two but the problem will be simpler if you recognise those numbers as "powers of 2": 2= 2^1, 4= 2^2, 8= 2^3, 16= 2^4, 32= 2^5.... Get the idea?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Apr 2013
    From
    Columbia, Maryland
    Posts
    4

    Re: Exponential word problem I'm having trouble with

    yeah, just a little rusty at it
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member
    Joined
    Nov 2007
    From
    Trumbull Ct
    Posts
    918
    Thanks
    27

    Re: Exponential word problem I'm having trouble with

    This is a geometric progression problem. Formula is
    n^th term = a*r^(n-1) where a is the first term r is ratio between each term and n is the number of term

    For 57^th week 2*2^56 =2^57 = 1.44 *10^17 or 1.44* 10 ^15 dollars (quadtrillion)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. trouble setting up derivative word problem
    Posted in the Calculus Forum
    Replies: 1
    Last Post: June 21st 2011, 08:35 PM
  2. Replies: 2
    Last Post: June 9th 2011, 10:54 AM
  3. Replies: 2
    Last Post: October 21st 2010, 11:20 AM
  4. Trouble with simple word problem
    Posted in the Algebra Forum
    Replies: 3
    Last Post: October 13th 2010, 03:47 PM
  5. atsat math word problem trouble....
    Posted in the Algebra Forum
    Replies: 2
    Last Post: October 23rd 2009, 07:17 PM

Search Tags


/mathhelpforum @mathhelpforum