1 (2 điểm). Cho hệ các vector U ={(1,2, );n (0, 1,− −1 n);(2,3,n+1);(1,0,2 −n)}. 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 .

Which of the following is the equation of a line that passes through the point (1,4) and is parallel to the x-axis a. y=1 b. y=4 c. x=1 d. x=4

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

You are updating your garage and the only thing left to paint is your garage day. you're only going to paint the slide that faces the street. the garage door is 9 fert 8inches tall and 120 inches wide. you need to know the surface area of the side of the garage door to determine how much paint to buy. the hardware store sells paint by how much covers a square foot. what is the surface area you should report to the hardware store what is the answer