Use polynomial identities to multiply (5 – 4x3)(5 + 4x3). O A. 25 - 4x9
B. 25 - 40x3 + 16x6
C. 25 - 4x6
D. 25 - 16x6

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.

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )