### Home > CC4 > Chapter 11 > Lesson 11.1.3 > Problem 11-31

11-31.

Over a three-year period, the value of a vintage VHS tape of “Charlene’s Greatest Hits” decreased from $20 to $1.99. Homework Help ✎

What were the annual multiplier and annual percent decrease?

Write the equation of a function that describes this situation.

Make a sketch of the graph of the function and a table of values for the first 5 years.

$20(*m*)(*m*)(*m*) = $1.99

The multiplier is 0.463.

How can you use that to find the percent decrease?

Use the starting value and multiplier you found in part (a) to write the equation.

*y* = 20(0.463)^{x}