Cho hệ các vector U={(1,2,8);(0,-1,-7);(2,3,9);1,0,6) } a) tìm số chiều và cơ sở W trong không gian con sinh bởi vector U b) tìm tham số k để u=(2,3,k^2+1) là 1 tổ hợp tuyến tính của W và tính [u]w

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?