Find the Angle Between the Vectors $\mathbf { u }$ And $\mathbf { v }$

Find the angle between the vectors $\mathbf { u }$ and $\mathbf { v }$ . Express your answer in degrees and round to the nearest tenth of a degree.
$$\mathbf { u } = 4 \mathbf { i } + 2 \mathbf { j } - \mathbf { k } , \mathbf { v } = 7 \mathbf { i } - 7 \mathbf { j } + 4 \mathbf { k }$$

A) $11.6 ^ { \circ }$
B) $11.8 ^ { \circ }$
C) $78.4 ^ { \circ }$
D) $90 ^ { \circ }$
E) $78.2 ^ { \circ }$

Correct Answer:

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