15. Given u = [-12, 6, k]&v=[4,-2, 4], find k so that u and are parallel. a) 4 b)-3 c) 6 d)-12 16. An object moves along a straight line in such a way that its position is s(t) = −5t³ + 17t², in which t represents the time in seconds. What is the object's acceleration at 2.7 seconds? a)-47 c) 17 b)-17.55 d) -81

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