Let's say that we were told that Jonathan had seven bills that were all 5's and 20's and we were also told that he had a total of $120. Set up and solve a system to help evaluate whether we could have been told true information.

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

How do you solve a question like this?

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.