Which situation results in a final value of zero?
the overall change in temperature when the temperature goes from to 10°F to –10°F
the total profit made when a person buys an item for $2 and then sells the item for $2
the overall change in altitude of a hot air balloon after rising 21 km from sea level
the total distance a person travels when he bikes 3 miles to school and then 3 miles back home from school