## Intermediate Algebra (6th Edition)

$574.5$ billion dollars
We are given that $f(x)=.19x^{2}+5.67x+43.7$ can be used to approximate the amount of restaurant food-and-drink sales, where x is the number of years since 1970 and f(x) is the sales (in billions of dollars). To calculate the sales in 2010, we will use $x=40$, because 2010 is 40 years after 1970. $f(x)=.19(40)^{2}+5.67(40)+43.7=574.5$ billion dollars