a. If a = 4i -3j + k, b = -i + j + 4k find a vector c such that a-b + c = 0
b. given the vectors a = 4i-3j and b = 6i + 8j find the magnitude and direction of a-b
c. given the vectors a = 5i + 2j and b = 3i-j calculate their magnitudes and the vector a-b

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