,
, 4², 
continuing the sequence, the next three terms will be
,
, 
the sequence is 256, 64, 16, 4, 1,
, 
Answer:
6 months and 24 days
Step-by-step explanation:
The coefficient of the third term in this expression is +2 from the term (+2x).
12 racks because 90 chairs divided into 8 racks, 11 racks is fully stacked with 8 chairs within it. while an addion rack will be added because 2 chairs is left. so the answer is 12 racks