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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §5.1 The Idea of the Integral, #19 · Calculus · Integrals

How many rectangles (enclosing the triangle) would you need before their areas…

This problem is about a company whose expense rate $v (x) = 6 - x$ is decreasing.

How many rectangles (enclosing the triangle) would you need before their areas are within $1$ of the correct triangular area?

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §5.1 The Idea of the Integral, #19

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