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Math Help - Average rate of change

  1. #1
    Newbie
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    Sep 2010
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    Average rate of change

    I can't get this question.

    Let f(x)= {-3x +7 if x<-1 and 10, if x>=-1}

    Find the average rate of change in the interval -5<x<5.

    I know the formula should be S(t1)-S(t2)/t1-t2, but i don't know what i'm doing wrong. I keep getting 12/10 as an answer.
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  2. #2
    Master Of Puppets
    pickslides's Avatar
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    I get

    \displaystyle \frac{f(5)-f(-5)}{5-(-5)} = \frac{10-(-3(-5)+7)}{5-(-5)} = \frac{10-(22)}{10}= \frac{-12}{10}=\frac{-6}{5}
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