Substitute the values for a, b, and c into b2 - 4ac to determine the discriminant. Which quadratic equations will have
two real number solutions? (The related quadratic function will have two x-intercepts.) Check all that apply.
0 0 = 2x2 – 7x - 9
0 0 = x2 - 4x + 4
0 0 = 4x2 – 3x – 1
0 0 = x2 – 2x – 8
0 0 = 3x2 + 5x + 3

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.

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function