Suppose you wish to determine whether [4.2 3.6 7.2 is in the span of 5.2 {3}) 3.6 22.2 9.2 25.4 (a) With this goal in mind, use rref on an appropriate matrix. (b) Is the given vector in the span of the other two? Explain how your computation justifies your answer. Are the three vectors above linearly independent or linearly dependent? Justify your answer.