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3. Each side of a square is increasing at a rate of 6 am/s. At what rate is the surface area of the ball increasing when the radium 18 8 cm? 4. The radius of a sphere is increasing at a rate of 4mmls. How fast is the volume increasing when the diameter is 80 mm? 5. The radius of a spherical ball is increasing at a rate of 2 cm/min. At what rate is the surface area of the ball increasing when the radium is 8 cm 2 9. Suppose 4x + 94 2- 25, whore s and y are functions of t. a. If dy / dt = , find doc when ac = & and y = 1. 6. If doc/ dt = 3, find dy when x = - 2 and y= 1 14. If a snowball melts so that its surface area decreases at a rate of I am?/ min. find the rate at which the diameter decreases when the diameter is 10 cm