Answer:
153.2 gallons per day
Step-by-step explanation:
To find out how much water he used each day, take the amount of water he used and divide by the number of days
1072.4 gallons / 7 days
153.2 gallons per day
47/8
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we are given
airthematic sequence
we can use nth term formula

n is number of terms
an is nth term
d is common difference
a1 is first term
We are given
a7=40
we can use it



a18 = 106


we can subtract both equations



now, we can find a1

we can plug d=6


12th term:

now, we can plug values



so, 12th term is 70...........Answer