Why Would you rather buy 18 eggs at this price 2/$8.00 or 18 eggs for 97c at buy 2 get 1 free

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.

Evaluate cos2θ for cosθ = square root of 3/2

Ineed to know the answer to this algebra question.