"Metrix" is not an English word. It might be a mis-spelling of "matrix", or of "metric".
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A matrix IS an array so it is impossible to multiply a matrix without array. The answer to the multiplication of two matrices need not be an array. If the first matrix is a 1xn (row) matrix and the second is an nx1 (column) matrix, then their multiple is a 1x1 matrix which can be considered a scalar.
It is true. Always establish pricing objectives.
An assumption is based upon the opinion and theory of the person who is assuming something. A conclusion is reached by establishing provable facts.
Advantage -- Less effort, cost, work Disadvantage -- Less accuracy, information, difficulty of establishing true 'randomness" in some samplings.
It is the theory of establishing three dimonsional positions of an area/field/ with respect to a known direction and known level. It is a very good application of trignometry.