dy for: (x + y) = x – y + 8 da 1. Find 2. If a ball is thrown vertically upward with a velocity of 80 ft/s, then its height after t seconds is s = 80t – 16t?. A. What is the velocity after 2 seconds and after 4 seconds? B. What is the maximum height reached by the ball? C. With what velocity does it hit the ground? 3. A circle has an initial radius of 100 ft when the radius begins decreasing at a rate of 2 ft/min. What is the rate of change of the area at the instant the radius is 10 ft?

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