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Homework Help: Finding dA

  1. Mar 5, 2014 #1
    1. The problem statement, all variables and given/known data
    Evaluate dA, where R is the rectangular region described in 0 ≤ x ≤ 10ln7 and 25 ≤ y ≤ 50

    2. Relevant equations
    dA = dxdy or dA = dydx

    3. The attempt at a solution
    I drew the rectangle on a Cartesian plane, but the problem is I don't know what the question is asking. I can set up a double integral with the limits they give me, but I don't understand how to calculate dA from any of the given information. Thanks for any clarity you can provide me.

    Edit: Nevermind, it was Firefox not showing information about the question, I can solve it now that the full question is displayed.
    Last edited: Mar 5, 2014
  2. jcsd
  3. Mar 8, 2014 #2
    Yeah, so the wording doesn't make any sense. "Evaluate dA" as in calculate the area of the rectangle? is there a surface f(x,y) = z or something? because if there isn't this problem seems trivial. A = 10ln(7)*25.
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