2A
1,000
The boiling point of water is affected by changes in elevation. Use the expression, where A represents the altitude in feet, to find the number of degrees Fahrenheit at which the boiling point of water changes at an altitude of 5,000 feet. Then explain it's meaning.

10 F: The boiling point increases 10 F at an altitude to 5,000 ft.
-10 F: The boiling point increases 10 F at an altitude to 5,000 ft.
10 F: The boiling point decreases 10 F at an altitude to 5,000 ft.
-10 F: The boiling point decreases 10 F at an altitude to 5,000 ft.