What is the coefficient of the term 67xy 1/7, 6, 6xy, and 6/7 which one do i pick?

In the diagram below what is the approximate length of the minor arc ab

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.

What is the frequency of the sinusoidal graph?