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Math Help - Help with limits?

  1. #1
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    Help with limits?

    For this question:Help with limits?-capture4.jpg I'm having a lot of trouble because I got that x's limit to infinity and -infinity was 100. Making III and IV right, but that isn't an option. What am I doing wrong? Thanks!
    Last edited by canyouhelp; March 16th 2014 at 05:37 PM.
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  2. #2
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    Re: Help with limits?

    I think you posted the wrong image
    Thanks from canyouhelp
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  3. #3
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    Re: Help with limits?

    Quote Originally Posted by Shakarri View Post
    I think you posted the wrong image
    Thanks! I fixed it
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  4. #4
    Senior Member sakonpure6's Avatar
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    Re: Help with limits?

    Let's think about this, as x approaches infinity what happens to the term 3000(a)^x?
    Spoiler:
    It gets very close to zero since a is 0< a <1 and this is a decreasing exponential function. So, 3000 x a very small number = very very small it is negligible. So just solve f(x) = 100 - (12000/400) = 70
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