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What is the size of the matrix resulting from

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

2. using calculations based on a perpetual inventory system, determine the inventory balance altira would report in its august 31, 2021, balance sheet and the cost of goods sold it would report in its august 2021 income statement using the average cost method. (round "average cost per unit" to 2 decimal places.)