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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §5.1 The Idea of the Integral, #16 · Calculus · Integrals

Draw the … curve from … to … and put triangles below…

This problem is about the company earning $x$ per year.

Draw the $x$ curve from $x = 0$ to $4$ and put triangles below to prove that the area under it is more than $5$ . Look left and right from the point where $1 = 1$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §5.1 The Idea of the Integral, #16

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