Help please geometry

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.

Find the roots of the equation below. x^2 - 6 + 9 = 0

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?