This is my best guess on these plz do not quote me :)
14) T
15) T
16) F
17) F
18) T
19) F
20) T
X= -24. Since y=6, x+5y also has to equal 6
Answer:
1917 Moskau
Fremd und geheimnisvoll
Türme aus rotem Gold
Kalt wie das Eis
Moskau
Doch wer dich wirklich kennt
Der weiß, ein Feuer brennt
In dir so heiß
Explanation:
Independet city-states mostly developed because either:
a - some of the city-states were isolated because they were islands
This is a good reason why a city-state can develop - as it's physically siolated
c - the mountains separated groups of people from one another.
d - people also depended on navigable rivers for travel and communication
The last one perhaps applying a bit less.