Trong không gian vector 3 ℝ cho hai hệ vector U u m u u = { 1 2 3 = − = = ( 2,2,5); (2,1,3); (3,1,3)} , V v m v m v = − −= { 1 2 3 = = ( ( 1,2,1); ,2,1); ( 1,7,4)} . a. Chứng tỏ U , V là hai cơ sở của 3

Jack lives on a farm and has a large backyard. the area of his rectangular backyard is of a square mile. if the width of the yard is of a mile, what fraction of a mile is the length of the rectangular backyard?

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

Do more republicans (group a) than democrats (group b) favor a bill to make it easier for someone to own a firearm? two hundred republicans and two hundred democrats were asked if they favored a bill that made it easier for someone to own a firearm. how would we write the alternative hypothesis?