Help please? i am a little bit confused

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

What is this inequality notation? t is less then or equal to 2

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.