Quick does anyone know any of these questions

What is the product? a-3/15a × 5/a-3

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.)

Lisette takes an ela exam and got 16 out of 27 questions correct. what percentage of the questions did lisette get correct?