Can someone explain to me how to fill this out?

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

When reading a textbook blank. a) it’s safe to assume that the ingot is not biased b) you should watch for fallacies in information and author bias c) you should fact check everything you read d) it is understood that academic sources are not biased

Which region was the hearth for the largest number of agricultural animals such as pigs sheep and cows