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2 questions

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 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Which of the following expressions is equal to 2x^2+8