The unchanging value of the ratio between two proportional quantities is O the constant of proportionality.
O the constant rate.
O the x-value of an ordered pair.
O the y-value of an ordered pair.

The constant of proportionality.

Step-by-step explanation:

Lets say a is directly proportional to b and k is a constant.

This can be expressed as;

a ∝ kb

This means that as the value of a rises, the value of b rise too.

k (the constant of this proportionality remain the same).

dc=6 square root of 3 and ac is 12 square root 3

c and d

step-by-step explanation:

square root of 3/2 = 18/c

cross multiply to get 18*2=√3*c

36/√3 * √3/√3 = c

c= 36*√3/3

c=12√3