A systematic relationship between two variables in which a change in one implies a corresponding change in the other is called .

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

1. evaluate 8x(2)y9(-2) for x=-1 and y=2 2. simplify the equation. -() 3. simplify the expression. [tex]\frac{5}{x(-2) y9(5)}[/tex]

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2