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.