## Related questions with answers

An emergency cell phone charger requires you to turn a small crank in order to create the energy needed to recharge the phone’s battery. If you turn the crank 120 times per minute, the total number r of revolutions that you turn the crank is given by r = 120t where t is the time (in minutes) spent turning the crank. a. Graph the function and identify its domain and range. b. Identify the domain and range if you stop turning the crank after 4 minutes. Explain how this affects the appearance of the graph.

Solution

VerifiedIt is given that $r=120t$ models the total number of revolutions $r$ that you can turn a crank in $t$ minutes.

In part (a) we need to graph the function and then identify its domain and range. In part (b) we need to determine what the domain and range would be if you stopped turning the crank after 4 minutes and explain how it would affect the graph.

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