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Integration question.

  1. Apr 29, 2009 #1
    1. The problem statement, all variables and given/known data

    Jon needs to bulk-up for next AFL season. His energy needs t days after starting his weight gain program are given by E(t) = 350(80 + 0.15t)^0.8 - 120(80 + 0.15t) calcories/day. Find Jon's total energy needs over the first week of the program.

    2. Relevant equations

    3. The attempt at a solution
    I integrated the fuction above and interval was [0, 7] as the question says total energy needs over the first week. The answer i got was 14377 but the answer is 14400.
    I think there is some problem with the interval or the value of C which i couldnt find.
    Help me please~
  2. jcsd
  3. Apr 29, 2009 #2


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    Science Advisor

    There is no "C" in this problem. What do you mean by that? If it were me, I wouldn't integrate. Since you are give "calories per day" and days are discreet quantities, I would just add E(0)+ E(1)+ E(2)+ E(3)+ E(4)+ E(5)+ E(6). Since E(7) is the calories needed after 7 days, it is not included in the calories consumed in the first 7 days.
  4. Apr 29, 2009 #3
    14378 is the answer i got from your method. And this question was under the heading of Integration so i think i should use integration method to solve it.
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