What is equivalent to 3 to the negative 2nd power

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

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.