ANSWER TO MATH QUESTION:

4.200x 10 to the fifth = 420,000 gallons/42 gal per barrel 10,000 barrels of water.

ANSWER TO SCIENCE QUESTION:

100 degrees Celsius is the boiling point of water and 0 degrees Celsius

is the freezing point 

ANSWER TO GEOGRAPHY QUESTION:

St. John is in the Virgin Islands.

ANSWER TO HISTORY QUESTION:

Saint Augustine is the oldest city in the United States. It was founded in 1565.