If x=7 and y=z and y=2 then what is 3y+ z

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Which statements regarding the diagram are true? check all that apply.

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.