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displacement vector and distance

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Hello I need help answering these problems.

Peter noticed a bug crawling along a meter stick and decided to record the bug's position in five-second intervals. After the bug crawled off the meter stick, peter created the table shown.
1. What is the displacement of the bug between t = 0.00 s and t = 20.0 s?
2. what is the total distance that the bug traveled between t = 0.00 s and t = 20.0 s? Assume the bug only changed the directions at the end of the five-second interval.

3. Which one of the physical quantities listed below is not correctly paired with its SI unit and dimensions?

4. A car travels in a straight line covering a total distance of 90.0 miles in 60.0 minutes. Which one of the following statements concerning this situation is necessarily true?

5. A canadian goose flew 845 km from Southern California to Oregan with an average speed of 30.5 m/s. How long, in hours, did it take the goose to make this journey?

6. Carl Lewis set a world record for the 100.0-m run with a time of 9.86 s. If, after reaching the finish line, Mr. Lewis walked directly back to his starting point in 90.9 s, what is the magnitude of his average velocity for the 200.0 m?

7. An elevator is moving upward with a speed of 11 m/s. Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. what is the average magnitude of the elevator during the 3.0 s interval?

8. Which one of the following is not a vector quantity?

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1. the displacement is always , where df is the final position, di is the initial position.
So the displacement d = 65.7 - 49.6 = 16.1 cm
Answer: e

2. From t = 0 to 5s, the bug was crawling to the left direction (assume right direction is positive along the x-axis). So it traveled cm.
From t = ...

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