If an is defined as a geometric sequence, is the sequence 1/an also a geometric sequence? Explain your reasoning?

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?

Jonathan puts $400 in a bank account. each year the account earns 6% simple interest. how much interest will be earned in 5 years?

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?