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3-16.

Notice that the velocity is negative when t > 4.5.

When velocity is negative, Stevie moves back towards his starting position.

Total distance is the area under a speed graph. Speed is the absolute value of velocity.

A speed graph is the absolute value of a velocity graph...
Area under a speed graph = total distance.
Area under a velocity graph = displacement.

Distance from starting point is known as 'displacement.'
Displacement is the area under a velocity graph.

Acceleration is slope on a velocity graph.

See hint in part (d).