Chứng minh rằng nếu xn là một dãy độc lập tuyến tính những phần tử của không gian Hinbe H thì tồn tại một hệ thống trực chuẩn en trong H sao cho
Lin e e Lin x x { ,... }= { ,... } 1 1 m m mọi m.

Sam makes his sales calls according to a pattern. he travels either north or south depending on the calendar. some of his past trips were as follows: on february 17, april 24, june 10, september 19, and november 3 he drove north. on february 28, may 25, august 22, november 20, and december 18, he drove south. describe sams' pattern. in which direction will sam drive on oct4 and oct 24?

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)