29. If the temperature changes from -22 C to 14 C, what is the change? Use the table showing Federal Air Transportation Revenue by Source for Exercises 30-33. 30. AVIA Express the difference in passenger ticket revenue in 2003 and 2002 with a signed number. 31. AVIA Express the difference in passenger ticket revenue in 2001 and 2000 with a signed number. 32. AVIA Find the difference in international departure tax revenue for 2002 and 2001. 33. AVIA Find the difference in total revenue from these two taxes for 2002 and 2001. Federal Air Transportation Revenue by Source (current