Serbia and greece
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B. is the answer i got a good grade on it trust me
The mongols invaded china with the intentions of having china under the Mongol Yuan rule.
IM NOT SURE BUT I THINK SHE ASKING HOW TALL IS THE BBUILDING KNOWING THAT EACH FLOOR IS 1m AND SHE RECORDING THE TIME FROM EACH FLOOR THE BALL IS DROPPING SO SHES TRYING TO FIGURE OUT HOW TALL IS THE BUILDING
