The sequence is geometric because it decreases by a factor of 1/27
You sum two vectors by summing the correspondent coordinates:

So, you have

Answer:12 gallons
Step-by-step explanation: It is enough to fill 40
Answer:
12.57
Step-by-step explanation:
3.14 times 2 squared
Answer:
4 I think
Step-by-step explanation:
hope this help's