Urologists are physicians who specialize in the health of the bladder. In a common diagnostic test, urologists monitor the emptying of the bladder using a device that produces two graphs. In one of the graphs the flow rate (in milliliters per second) is measured as a function of time (in seconds). In the other graph, the volume emptied from the bladder is measured (in milliliters) as a function of time (in seconds). See Figure 6.12.
(a) Which graph is the flow rate and which is the volume?
(b) Which one of these graphs is an antiderivative of the other?

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(1) € 5 5 10 15 20 25 30 10 15 20 25 30 Figure 6.12 seconds seconds