The common geographic factor for Egypt and the fertile crescent were the big rivers, they made big alluvial deposits on their shores each year and allowed the people to have sufficient amount of food production. That opened the gates for civilizations to flourish in this places.
well if she has 15 now then you add 3 to 2 which is 5 then add that to the 15 so you get 20 in total then minus th3 6 she made today you get 14 divided by 2 which is 7 she made 7 yesterday and 13 today which is 20 so the answer is 7
