What is the identity element for addition of rational numbers. (FIRST ONE TO ANSWER GETS POINTS)​

Which of the following best describes how the maya civilization was governed

Which answer best describes an advantage of shipping goods by canal? a) most towns would rather have canals then noisy railroads b) goods could travel very fast downstream in the canal system c) traveling by boat is a much more relaxing way to transport goods. d) heavy loads of goods could travel by boat more easily then if pulled by horses.

Approximately how many americans, from both the north and the south, were killed in battle during the civil war?