Is the relation a function?

(-2 ,4) (3, 7) (0, 8) (5, 8) (1, 6)

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

10% of 1,900,000. show me how you got the answer

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.