1.[1pnints}LetAbeanmxnmatrixandletbeannxpmatrix.lftheseeondrowofA consists onlyr of zeros1 what can be said about the seoond row of AB? Justify your answer. 2. [1 points} Let A be an m. X 71 matrix and let B be an n X p matrix. Show that if the columns of B are linearly dependent, then the oolnmns of A3 are also linearly dependent. 3. [:1 points) If u and \"u are VEGIJOI'E in 13,\