Which of the following is the conjugate of a complex number with 2 as the real part and 7i as the imaginary part? (5 points)

What is the value of the expression below? (81^2)^1/8

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

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.