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22. Suppose a forest fire spreads in a circle with radius changing at a rate of 8ft/min. When the radius reaches 200 feet, at

22. Suppose a forest fire spreads in a circle with radius changing at a rate of 8ft/min. When the radius reaches 200 feet, at what rate is the area of the burning region increasing? 23. A gas is poured into a spherical balloon at a constant rate of 15cm/s, at what rate is the fadius of the balloon increasing when the radius is 8cm. Hint: V volume of the sphere

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