Question: A ball is rolling along the x -axis. Its position (in feet) at time x (in seconds) is given by f(x)=2x . Find its instantaneous

A ball is rolling along the x -axis. Its position (in feet) at time x (in seconds) is given by f(x)=2x . Find its instantaneous rate of change when x=9 seconds. Select one: a. 6ft/sec b. 112ft/sec c. 13ft/sec d. 23ft/sec

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