Answer:
14
Step-by-step explanation:
The spores always x3 after a month so going a month back they ÷3 instead so 900÷3 is 300 spores on the first month
h=-16²+12t+6
8=-256+12t+6
256-6+8=12t
-258=12t
t=-258/12
t=21.5
