## Algebra 1: Common Core (15th Edition)

$119$ billion
The formula for Constant rate of change is $\frac{△y}{△x}$. Let's take 2 sets of coordinates and plug it in to this formula. $\frac{1,838,000,000,000 - 1,243,000,000,000}{2005-2000} = \frac{595,000,000,000}{5} =119,000,000,000$ The constant rate of change is $119$ billion.