Sum to n terms of the series 3.2+5.2+7.2

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.

Which equation matches the graph shown ?

What is the correlation coefficient between the variables? round to three decimal places. enter your answer in the box