Two continental tectonic plates move apart at about 3 cm/year. How wide will the gap between those continents be in 15 years?

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

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

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b