In Chad's reading class, all the students are reading the same book. The school bought each student a book at $7 per book. If there are 27 students in Chad's class, which of the following expressions could not be used to calculate the total cost?
7(30) - 7(7)
7(20) + 7(7)
7(30) - 7(3)
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option a
Step-by-step explanation:
total cost =27×7
in case of a it comes out
=210-49
=161
so the expression is incorrect
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