Donald sells 760 marbles every day. he sells each marble for 1.5 dollars.
for how many days does donald need to sell marbles to earn 3420 dollars?

What can you determine about the solutions of this system

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.

If 25% of y is 30, what is 60% of y?