Respuesta :

choixongdong

Answer:

C. 9

Step-by-step explanation:

81 = 9 x 9

18 = 9 x 2

so the greatest common factor (GCF) of 81 and 18 : 9

Answer is C. 9

Alienesque

the answer is C. 9 bc 9 goes into 81 and 18