A student answered 81 problems on a test correctly and received a grade 90% how many problems were on the test if all the problems were worth the same number of points

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

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.

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180