Tell me the answer please. Give me a short answer and a step-by-step explanation.

What is (28 + 7 + 6 + 3) x 1/2 show your work

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

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.