30 what is the solution for the system of equations? use the substitution method to solve. 2x+y=20 −5y=−6x+12 enter your answer in the boxes.

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.

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Nikolas calculated the volume of the prism. his work is shown below.