Anumber is randomly selected from {15, 16, 17, 18, 19, 20}. a is represented by the event that the number picked is less than or equal to 16. what is the probability of the complement of event a? 16 13 23 56

1. what is the measure of ∠abc? what is the measure of ∠abd?

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?