Question: 2. Given the vector function r (t) = (7 4t 8t) + (5 9t 3t) j + (2 6t + t) k. If f(t)=

2. Given the vector function r (t) = (7 4t 8t) + (5 9t 3t) j + (2 6t + t) k. If f(t)= || r' (t) || then f'(1) (rounded to two decimal places) is equal to: (a) 16,71 (b) 15,88 (c) 13,34 (d) 11,58 (e) 19,90

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