Converting between Cartesian and polar coordinates when only one of each is known.

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Cartesian coordinates of a point are given by (7, y), and its polar coordinates are given by (r, 11pi/6). Find y and r. Assume r is equal to or greater than 0.

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Hint: Draw a picture: You should show the $\frac{11\pi}{6}$ ray and see where it intersects the vertical line $x=7$.