Respuesta :

A. pi/6

Irrational numbers are not able to be written as fractions or non-recurring decimals.

B. 8.1 = 81/10
C. 11.999999.... = 12 = 12/1
D. sr(36) = 6 = 6/1

pi is already irrational so dividing it by 6 does not fix that
good job