The ordered pairs (1, 1), (2, 8), (3, 27), (4, 64), and (5, 125) represent a function. what is a rule that represents this function?
a. y = x
b. y = 4x
c. y = x2
d. y = x3

The functions would be:

D. y=x³

We can check it out.

(1,1); x=1; y=1 ⇒1=(1)³=1*1*1=1
(2,8); x=2; y=8 ⇒8=(2)³=2*2*2=8
(3,27); x=3; y=27 ⇒27=3³=3*3*3=27
(4,64): x=4; y=64 ⇒64=4³=4*4*4=64
(5,125); x=5; y=125 ⇔ 125=5³=5*5*5=125