Question: A rectangle has one vertex on the line y = 10 x, x > 0, another at the origin, one on the positive x-axis,

A rectangle has one vertex on the line y = 10 – x, x > 0, another at the origin, one on the positive x-axis, and one on the positive y-axis. Express the area A of the rectangle as a function of x. Find the largest area A that can be enclosed by the rectangle.

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