3.point p lies on the directed line segment from a (2,3) to b(8,0) and partitions the segment in the ratio 2 to 1.
what is the x-coordinate of point p?
4. determine the area of the rectangle abcd with vertices  a(−1,−1), b(2,3), c(10,−3), d(7,−7)

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.