Câu 1 (2 điểm). Cho hệ các vector U ={(1,2,8 );(0,-1,-7); (2,3, 9);(1,0,-6) } . a. Tìm số chiều và một cơ sở W của không gian con sinh bởi hệ vector U .
b. Tìm tham số k để u=(2,3, k2+1) là một tổ hợp tuyến tính của W , và suy ra [u ]W .

What is the slope of a line that is perpendicular to y = 3x + 1

Powerful women's group has claimed that men and women differ in attitudes about sexual discrimination. a group of 50 men (group 1) and 40 women (group 2) were asked if they thought sexual discrimination is a problem in the united states. of those sampled, 11 of the men and 19 of the women did believe that sexual discrimination is a problem. if the p-value turns out to be 0.035 (which is not the real value in this data set), then at = 0.05, you should fail to reject h0. at = 0.04, you should reject h0. at = 0.03, you should reject h0. none of these would be a correct statement.

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 4x^2 - 19x- 5