Can Someone please help, the picture is below

:calculate the sum of the interior angles of a 13-sided polygon.

Acharreadas is a popular mexican thing where people display varying skills of horsemanship much like what events in the united states?

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire