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What is the missing constant term in the perfect square that starts with x^2 -20x

At the county fair, the baxter family bought 6 hot dogs and 4 juice drinks for $12.90. the farley family bought 3 hot dogs and 4 juice drinks for $8.55. find the price of a hot dog and the price of a juice drink.

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is