Does anyone the answer to this question? i've to tried to answer the question but my outcome is wrong.

Find the coordinates of a if b(-9,-10) is the midpoint of ac and c has the coordinates of (-1,9)

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

The body paragraphs in an informative essay should include clear examples. a thesis statement. restated evidence. a clear direction.