Which set is a function?

A)
{(0,3), (3,0), (0,4), (4,0)}

B)
{(0,2), (2,0), (4,6), (6,4)}

C)
{(2,6), (3,6), (4,6), (2,0)}

D)
{(6,2), (2,0), (4,6), (6,4)}

D)

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters