Results 1 to 8 of 8

Math Help - Maths Temperature Question.......DEADLYY.Teacher can't do it!!!!!!!!!

  1. #1
    Banned
    Joined
    Mar 2008
    Posts
    16

    Exclamation Maths Temperature Question.......DEADLYY.Teacher can't do it!!!!!!!!!

    When coffee is made its temperature is 90°C. After t minutes the temperature of the coffee is given by:
    90(0.88)t°C

    Find after how many minutes the tempertaure of the coffee is 45°C.

    Thank you.PLease note that in the above equation for temperature, the t is to the power of 0.88.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Bar0n janvdl's Avatar
    Joined
    Apr 2007
    From
    Meh
    Posts
    1,630
    Thanks
    6
    Quote Originally Posted by eftheking View Post
    Thank you.PLease note that in the above equation for temperature, the t is to the power of 0.88.
    Now you say it (Or I only see it now )

    90(0,88)^t = 45

    0,88^t = \frac{45}{90} = \frac{1}{2}

    t = log_{0,88} {0,5}

    t = 5,4223
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Banned
    Joined
    Mar 2008
    Posts
    16

    Smile

    much appreciated
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Banned
    Joined
    Mar 2008
    Posts
    16
    why use log tho
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Bar0n janvdl's Avatar
    Joined
    Apr 2007
    From
    Meh
    Posts
    1,630
    Thanks
    6
    Quote Originally Posted by eftheking View Post
    why use log tho
    I guess you could have drawn a graph of the function... But that's a long tedious way. What's your idea of solving it?
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Banned
    Joined
    Mar 2008
    Posts
    16
    i dint have an idea lol.so its 5minutes then?also, i ahve another question if u would like 2 view.
    South Africa is pretty sweet tbh lol
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Bar0n janvdl's Avatar
    Joined
    Apr 2007
    From
    Meh
    Posts
    1,630
    Thanks
    6
    Quote Originally Posted by eftheking View Post
    i dint have an idea lol.so its 5minutes then?also, i ahve another question if u would like 2 view.
    No you will not get such an exact answer with a graph so its not that good an idea, unless you might be using computer graphing software.

    I answered your other question too.

    Quote Originally Posted by eftheking View Post
    South Africa is pretty sweet tbh lol
    Thank you!
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Banned
    Joined
    Mar 2008
    Posts
    16
    wow thanks.bet ya u wont be able 2 do the 17marker.what a way to finish a past paper like lol
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Wordy question, about rate of temperature increase.
    Posted in the Differential Equations Forum
    Replies: 1
    Last Post: April 25th 2010, 02:03 PM
  2. [SOLVED] Simple temperature question.
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 26th 2009, 01:07 PM
  3. “Please teacher why should I do Maths”
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: July 3rd 2009, 10:52 AM
  4. please help me with a maths question
    Posted in the Geometry Forum
    Replies: 1
    Last Post: November 14th 2008, 01:05 AM
  5. Question for Maths
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: November 13th 2007, 02:36 AM

Search Tags


/mathhelpforum @mathhelpforum