Solve for r: A=2 pi r squared

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

17. a researcher measures three variables, x, y, and z for each individual in a sample of n = 20. the pearson correlations for this sample are rxy = 0.6, rxz = 0.4, and ryz = 0.7. a. find the partial correlation between x and y, holding z constant. b. find the partial correlation between x and z, holding y constant. (hint: simply switch the labels for the variables y and z to correspond with the labels in the equation.) gravetter, frederick j. statistics for the behavioral sciences (p. 526). cengage learning. kindle edition.

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)