Answer:
3
Step-by-step explanation:
17 * 3 = 51
51 * 3 = 153
153 * 3 = 459
etc.
.
Hope this helps.
108 divide 12 and i got 9
then i did 9-3 and i got 6.
12+12+9+9=42
So the perimeter is 42
Welp i don't know if it is correct or not