Determine the radius of curvature of the curve $x = y^3$ at point (1, 1).

A.   5.27 C.   5.56
B.   5.65 D.   5.72


Gas is escaping from a spherical balloon at a constant rate of 2 ft3/min. How fast, in ft2/min, is the outer surface area of the balloon shrinking when the radius is 12 ft?

A.   1/2 C.   1/3
B.   1/5 D.   1/4


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