Chapter 1 - Equations and Inequalities - 1.5 Applications and Modeling with Quadratic Equations - 1.5 Exercises - Page 129: 8

Option C: $$S = 0.0538(10)^2 - 0.807(10) + 8.84$$

For the formula: $S = 0.0538x^2 - 0.807x + 8.84$ If $S=$sales in millions, and $x$ represents the year, with $x=1$ representing the year $2001$, then the year $2010$ is represented by $x=10$ So to find the number of sales in millions in $2010$ we use the formula: $$S = 0.0538(10)^2 - 0.807(10) + 8.84$$ Which is option C.