Imagine a plane leaves Ronald Reagan airport and travels along vector A northeast towards Annapolis. When it reaches the city, the plane turns toward the northwest to reach Baltimore travelling over vector B. Next it turns back to the southwest, takes vector C to Dulles airport and returns home on vector D. Now imagine you start from the same position, but this time your first trip goes in the direction of vector B. Then you travel by vector C, D, and finally A. What is your destination this time

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.

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

What are similarities and differences of reflection, refraction, diffraction and absorption?