The pentagon's area is the sum of the 5 triangles that comprise it. This is

where the factor of 2 accounts for the top and bottom. The walls have an area of 5 rectangles
25,678 rounded to the nearest 10,000 would be 30,000
I think 2,057.21 because 18,541.89 divided by 9 is 2,057.21
Answer:
The Olympic sized swimming pool hold 660501.9 gallons of water.
Step-by-step explanation:
Given that:
Water hold by an Olympic sized swimming pool = 2500000 liters
We know that;
1 gallon = 3.785 liters
Therefore,
We will divide the total number of water in liters by 3.785 to find the number of gallons.
Gallons of water in pool = 
Gallons of water in pool =
gallons
Hence,
The Olympic sized swimming pool hold 660501.9 gallons of water.