Solve the problem.The flow rate r (in gallons per minute) of water from the nozzle of a firefighter's hose can be modeled by the formula r = 30d2
where d is the nozzle diameter (in inches) and P is the nozzle pressure (in pounds per square inch). If the nozzle pressure is 144 pounds per square inch, use the model to estimate the flow rate of water for a nozzle diameter of 1.5 inches.
A. 6480 gal/min
B. 9720 gal/min
C. 810 gal/min
D. 540 gal/min
Answer: C
Mathematics
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