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
C^2 - d^2 / d^2 + cd - 2c^2
= cd + c^2 - 2c^2 - d^2 / d^2
= cd - c^2 - 1 (answer)
7.5 = x +

equals
x = 6.
First, subtract

from both sides. / Your problem should look like: 7.5 -

= x.
Second, simplify 7.5 -

to 6. / Your problem should look like: 6 = x.
Third, switch sides. / Your problem should look like x = 6, which is your answer.