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Wonderful! Moving to the right means velocity is +ve, and moving to the left means it is -ve. As you can see in the image, when the car is moving from 2 - 4 s to the left, its velocity is -ve. When it is not moving, its velocity is \(0\).
Using the same graph, calculate the car's displacement from \(0 \, \mathrm{s}\) to \(2 \, \mathrm{s}\) and from \(2 \, \mathrm{s}\) to \(4 \, \mathrm{s}\)

(0 m, 20 m)

(20 m, 0 m)

(0 m, -20 m)

(20 m, -20 m)