The constant of proportionality is usually presented as the variable k. It is usually written as:
f(x) = kx
where f(x) means a function of x. It can also be another variable, for example, y,
We test each pair to find k,
24 = 6k
k = 24/6 = 4
72 = 18k
k = 72/18 = 4
216 = 54k
k = 4
648 = 162k
k = 4
Thus, the answer is A. yes and k=4.
