Hi please help :)

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Over the course of a month, a person's weight decreases. what type of relationship is this? a. positive relationship