#### Answer

There were around $7.296$ million students who took at least 1 online college course in 2012.

#### Work Step by Step

Since $x=0$ corresponds to the year 2002 and $x=1$ corresponds to the year 2003, , then $x=10$ corresponds to the year $2012$.
Substitute $10$ to $x$ to obtain:
Number of students
$\\= 0.0112(10^2)+0.4663(10)+1.513
\\=0.0112(100)+4.663 + 1.513
\\=1.12 + 4.663 + 1.513
\\=7.296$
Thus, there were around $7.296$ million students who took at least 1 online college course in 2012.