A student needs to find the area of a rectangle with a length of 12 cm and a width of 7 cm. The student writes: Area = 12 + 7 = 19 cm². What error did the student make?
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A
The student used the wrong formula; area is length × width, not length + width
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B
The student forgot to include the units
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C
The student should have doubled the answer
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D
The student used the correct formula but made an arithmetic error