6.4 Practice A
Exponential Growth & Decay
In Exercises 1-3, identify the initial amount a and the rate of growth
(as a percent) of the exponential function. Evaluate the function when
t = 5. Round your answer to the nearest tenth.
1. y = 50(1.25)
2. y =
172(1.3) 3. y = 1000(1.75)
In Exercises 4 and 5, write a function that represents the situation,
4. Profits of $100,000 increase by 15% each year,
5. College enrollment of 41,000 increases by 7% every year.
6. The number of food trucks in a city has been increasing by 50% annually.
There were two food trucks in the year 2010
a. Write an exponential growth function that represents the number of
food trucks t years after 2010,
b. How many food trucks will there be in the year 2030? Does this sound
reasonable? Explain,