A spherical ballocn is inflated. During each second, its radius expands by an amount equal to 0.01 inch less than the radius expanded during the previous second. If the radius R expands at therate of 0.35 inches per second when R 18, what is the value of R exactly 30 seronds later? A 30.14 B 23.14 24.15 D 20.78

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