Kylee is running on the track. She starts off at the 200m line and runs to the 800 m line. She realizes she forgot her watch so she turns around and runs to the 450m line when she realizes it was in her pocket. What was her total displacement?

Plss anybody know how to do this? ? i need the answers from a through d

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

Will a heavier bowling ball hit pins better than a lighter bsll