They <span>had flood control projects, just like cities had irrigation.
I hope this helps! :D
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Answer: a
Explanation: because a classified document means it's important
B) Bartering was the earliest form of trade
Amount of room hannah can paint in an hour = 1/20
amount of room destiny can paint in an hour = 1/16
number of hours = x
1/20x + 1/16x = 1
the reason why this formula is true is, the amount of the room painted in the end should be 1 (the whole room)
4/80x + 5/80x = 1
9/80x = 1
9x = 80
x = 80/9 hours
<span>x = 8.89 hours</span>
