Calculate 6.75-3.1 and round to the correct number of significant digits

Someone me what is the area of this figure? 18m 18m 8m 16m

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.)

Select all of the following expressions that are equal to 2.5.