3. Suppose you are given the matrices A, B, C, and D below. 4 -2 10 3 1 3 -. -3 -2 -1 C = D = 1 A = B = 1 -4 -2 1 1 5 -7 3 6 -5 -3 2 -5 (a) Is it possible to compute A +C? If it is, find A+C. If not, why not? (b) Is it possible to compute D – A? If it is, find D – A. If not, why not? (c) Is it possible to compute A· C? If it is, find the dimensions of A · C. If not, why not? (d) Is it possible to compute A · B? If it is, find the dimensions of A · B. If not, why not?

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A:

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