![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Find the average exam score after 3 months.
\The average exam scores can be modeled by ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5e7131638d7996f88e19aad370ba4a63.png\")
, where ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8da2268e35b6b6daab9c47f71c4c8bf4.png\")
is the number of months since the initial exam.
The average exam score after 3 months ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=470fba7ef163eea32bffc90ff6549cc1.png\")
.
Substitute ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=470fba7ef163eea32bffc90ff6549cc1.png\")
in ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5e7131638d7996f88e19aad370ba4a63.png\")
.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=89c85f19bf03b504fc8ce912596e6464.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b0afc248e12b21ea7abbcb50b0e29b91.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d581c65a2946927e48858a755286b366.png\")
.
The average exam score after 3 months is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b7be7a1593073e702c212c181afec75a.png\")
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The average exam score after 3 months is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b7be7a1593073e702c212c181afec75a.png\")
.