World tourism the receipts in billions of dollars for world

Question

Question: World tourism the receipts (in billions of dollars) for world tourism can be modeled by the function

y = 165.550(1.055^x)

where x is the number of years past 1980.

(a) Write the function that models the rate of change in the tourism receipts.

(b) Predict the rate of change of tourism receipts in 2015.