A right circular cylinder with a piston at one end is filled lied with gas. Its volume is continually changing because of the movement of the piston If the temperature of the gas is kept constant, then, by Boyle's Law, PV = k, where P is the pressure (pounds per square inch), V is the volume (cubic inches), and k is a constant. The pressure was monitored by a recording device over one 10-minute period. The results are shown in Figure 13. Approximately how fast was the volume changing at t = 6.5 if its volume was 300 cubic inches at that instant? (See Example 6.)

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