Answer:
$1.90
Step-by-step explanation:
Let n represent the cost of a notebook. Jenna's purchase is ...
4n +3(n -1.15) = 9.85
7n - 3.45 = 9.85 . . . . . simplify
7n = 13.30 . . . . . . . . . . add 3.45
n = 1.90 . . . . . . . . . . . . divide by 7
The cost of a notebook is $1.90.
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<em>Additional comment</em>
The cost of a folder is 1.90 -1.15 = 0.75. The total purchase is ...
4(1.90) +3(0.75) = 7.60 +2.25 = 9.85
