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3. (3 marks) A particle moves on the line y = 2x + 1 in such a way that its r-coordinate changes at a constant

3. (3 marks) A particle moves on the line y = 2x + 1 in such a way that its r-coordinate changes at a constant rate of 4 units per second. A right triangle is formed by the vertical line from the particle to the r-axis, the line connecting the particle to the origin, and the r-axis. At what rate is the area of the right triangle changing when r = 4

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