Find the missing value in the ratio table. Then write the equivalent ratio

What expression is equivalent to 42x-56y

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

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.)