Exponential Decay Ratio

What does the "a" represent in exponential growth and decay formulas?

What does the "r" represent in an exponential growth or decay function?

What does the "t" represent in exponential growth or decay functions?

What is the equation for exponential growth and decay?

The cost of tuition at a college is $12,000 and is increasing at a rate of 6% each year. Use an exponential function to find the tuition cost after 4 years.

Annual sales for a company are $149,999 and are increasing at a rate of 6% per year. Use an exponential function to find the annual sales after 7 years.

In 1985, there were 285 cell phone subscribers in Mayville. The number of subscribers increased by 75% per year after 1985. Find the number of subscriber in 2008.

The value of a car is $18,000 and depreciating at a rate of 12% per year. Use an exponential function to find the value of the car after 10 years.

An investment of $8200 loses value at a rate of 2% per year. Use an exponential function to find the value of the investment after 9 years.

The population of a town is decreasing at a rate of 2.5% per year. If the population in 2000 was 28,000, what is the expected population in 2015 if this rate of decrease continues?

What does the "r" represent in an exponential growth or decay function?