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Asoccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 in

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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.