Question: If it is known that vector a = 3i +4j -k and vector b = -5i +6j and c=5k then determine 1. the value of

If it is known that vector a = 3i +4j -k and vector b = -5i +6j and c=5k then determine 1. the value of m if m= a . ( b+c) and the angle between vector a and vector b?

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