29. Suppose f(x, y) is continuous over a region R in the plane and that the area A(R) of the region is defined. If there are constants m and M such that m < f(x, y) < M for all (x, y) e R, prove that mA(R) < f(x, y) dA < MA(R).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 12T
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29. Suppose f(x, y) is continuous over a region R in the plane and that
the area A(R) of the region is defined. If there are constants m and
M such that m < f(x, y) < M for all (x, y) e R, prove that
mA(R) <
f(x, y) dA < MA(R).
Transcribed Image Text:29. Suppose f(x, y) is continuous over a region R in the plane and that the area A(R) of the region is defined. If there are constants m and M such that m < f(x, y) < M for all (x, y) e R, prove that mA(R) < f(x, y) dA < MA(R).
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