1.) which of the following set of ordered below represents not function?
a. (4,0), (4,1), (4,2), (4,3)
b. (3,3), (o,o), (-3,3), (4,0)
c. (2,0), (-1,2), (-1,3), (2,4)
d. (2,0), (2,-4), (2,3), (1,1)

2.) evaluate the algebraic expression (x+3)÷ 4 - 15÷ 2xy, when x = 5 and y = -1.
a. 1/2
b. 7/2
c. - 1 and 3/10
d. 2 and 7/2

3.) is 4 units_____the axis and 3 units to the _____ of the axis
a. above, left
b. below, left
c. above, right
d. left, right