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Post this question to forum When running a 100-meter race Usain Bolt reached his top speed when he was 55 meters from the starting line and had been running for 5.6 seconds since the start of the race. He passed the 85 meter line of the race when he had been running for 7.4 seconds since the start of the race. Let t represent the number of seconds since the start of the race. Let d represent Usain's distance from the starting line of the race. a. What was the change in time, At, as the number of seconds since the start of the race increased from 5.6 seconds to 7.4 seconds? At = Preview b. On the number line below, represent the change in t that you found in part (a). Clear All Draw: c. Determine Usain's change in distance, Ad, as he traveled from 55 meters to 85 meters from the starting line of the race. Ad = Preview d. On the number line below, represent the change in d that you found in part (c). d 15 30 45 75 90 Clear All Draw: e. True or False? The vector which represents the change in time, At, represents a continuous variation in t. False True Submit Question 9. Points possible: 4 License