What would be the 70 term and how do you know

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.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'