Which of the following exponential functions best describes the table below?
x: -0.1, 0 , 0.1 , 0.2
y: 6, 3, 1.5, 0.75
a) y=6(1/2)^10x
b) y=3(1/2)^x/10
c) y=3(1/2)^10x
d) y=3