Answer:
Step-by-step explanation:
It is an arithmetic sequence with common difference d = -7
a₂₉ = a₄ + (29-4)d = -61 + 25(-7) = -236
21 gallons
4 quarts = 1 gallon
16 quarts = 4 gallons
25 gallon - 4 gallons = 21 gallons
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