Riemann sum help

  1. Riemann sum help!!!!

    1. The problem statement, all variables and given/known data
    Use Riemann sum with ci= i3/n3
    f(x)= [tex]\sqrt[3]{x}[/tex] +12
    from x=0 to x=18
    n= 6 subintervals
    Approximate the sum using Riemann's Sum

    2. Relevant equations
    [tex]\Sigma f(ci) \Delta[/tex] xi
    is the equation for riemanns sum i think

    3. The attempt at a solution
    i tried plugging in stuff using that, but i must've done something wrong because the answer i got was 200 off the actual area under the curve...
  2. jcsd
  3. Re: Riemann sum help!!!!

    also, is my original equation for riemann's sum correct? is there a limit involved?
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