Bob bought a bike for $40 and sold it for $60, he made a profit of what percent? show work

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.

Which of the following are accepted without proof in a logical system? check all that apply.

Which letters from the table represent like terms? a and b b and c a and d b and d