The number of butterflies visiting a nature station is declining by 18% per year. In 2012, 3600 butterflies visited the nature station.

1. What is the decay factor in the annual butterfly count?
   Answer:
2. Write a formula for $B(t)\text{,}$ the number of butterflies $t$ years after 2012.
   $B(t)=$
3. Complete the table and sketch a graph of $B(t)\text{.}$

   $t$	$0$	$2$	$4$	$6$	$8$	$10$
   $B(t)$