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Math Help - Basic Problem of something more?

  1. #1
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    Oct 2011
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    Basic Problem of something more?

    Hi everyone,

    I wonder if someone could have a look at this for me please, I know it's basic but I can't seem to get the answer they have in the book.

    Find t in the equation

    175.51 + (-44558) + 20.556(t - 25) = 0

    My way is as follows

    -44383 + 20.556(t - 25) = 0

    -44383 + 20.556t = 0 + 25

    (25 + 44383) / 20.556 = t

    This gives me 2160.34, the answer quoted in the book is 2356.16

    Which one is correct and if it's the latter what am I doing wrong?

    Thanks in advance
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  2. #2
    Super Member Quacky's Avatar
    Joined
    Nov 2009
    From
    Windsor, South-East England
    Posts
    901

    Re: Basic Problem of something more?

    You've made several errors:
    1) You forgot the .51 between steps 0 and 1
    2)You've expanded 20.556(t-25) incorrectly. This means:
    20.556(t)-20.556(25)

    How I'd start: multiply everything by 1000:

    175510-44558000+20556(t-25)=0

    Rearrange:

    20556(t-25)=44558000-175510

    Divide both sides by 20556:

    t-25=\frac{44558000-175510}{20556}

    t=25+\frac{44558000-175510}{20556}

    However this does not give the answer you suggested. Are you sure you've written the question correctly?
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