RR 1-4 hello can i get a step by step on how to solve these

Problem 4.1. A stone dropped into a still pond sends out a circular ripple whose radius increases at a constant rate of 3 ft/s. How rapidly is the area enclosed by the ripple increasing at the end of 10 s? Problem 4.2. Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 6 mi?/h. How fast is the radius of the spill increasing when the area is 9 mi?? Problem 4.3. A spherical balloon is inflated so that its volume is increasing at the rate of 3 ft3/min. How fast is the diameter of the balloon increasing when the radius is 1 ft? Problem 4.4. A spherical balloon is to be deflated so that its radius decreases at a constant rate of 15 cm/min. At what rate must air be removed when the radius is 9 cm