Determine whether each set of ordered pairs shown below is from a geometric sequence or from an arithmetic sequence.

{(-3, 7.5) , (-2, 10) , (-1, 12.5)}
a) geometric sequence
b) arithmetic sequence

write the equation of the graph for the set of ordered pairs.

{(1, 150) , (2, 112.5) , (3, 84.375)}
a) geometric sequence
b) arithmetic sequence

write the equation of the graph for the set of ordered pairs
a)y=200(0.75)x
b)y=-2.5x+15
c)y=200(0.75)x
d)y2.5x+15