Find the sum of the first 20 terms of the arithmetic sequence: (Use image below)

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.)

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges

What is the value of x? enter your answer in the box.