Find the fourth term of the geometric sequence ,given the first term and common ratio a1=8 and r=4

At which value in the domain does f(x) =0?

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.

Factor this polynomial completely x^2-64