20. A scientist recorded the movement of a pendulum for 10 s. The scientist began recording when the pendulum was at its resting
position. The pendulum then moved right (positive displacement) and left (negative displacement) several
times. The pendulum took 2 s to swing to the right and return to the starting position, and 2 s to swing to
the left and return to the starting position. The pendulum's furthest distance to either side was 6 in. Graph
the function that represents the pendulum's displacement as a function of time.
(a) Graph the function.
(b) Write an equation to represent the displacement of the pendulum as a function of time.
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