The expression is 3n 8.
\
= 3(7) 8 (Substitute: n = 7)
= 21 8 (Multiply: 37 = 21)
= 13 (Subtract: 21 8 = 13)
The value of the expression is 13.
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8.![\"\"](\"http://c4anything.com/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=90a2dffa4cf28836c23bfcd658a94d29.png\")
8 (Substitute: n = 7) 8 (Multiply: 3![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4838e363eca1a46b22f36460670b1507.png\")
7 = 21) 8 = 13)![\"\"](\"http://c4anything.com/userfiles/image/steps_images/solution.JPG\")