What is the vertex of the parabola given by y = -(x − 2)2 − 1?

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.

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

How can you tell when x and y are not directly proportional?