Find ((x? + 4y)i + 4y j) · dr where C consists of the three line segments from (3,0, 0) to (3, 5,0) to (0,5, 0) to (0, 5, 3). L(x? + 4y)i + 4y°j) · di =

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A: Shown below

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A: Here we find the equation of tangent plane.