Answer:
The student incorrectly simplified .
Thus, option D is correct.
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Step-by-step explanation:
The formula to determine the Perimeter of a rectangle of width w and length l is expressed as:
In other words, the perimeter can be determined by multiplying the length and width by 2 and adding the result.
In our case, the dimensions of a rectangle are and
.
Here is the student's solution:
The student made an error in calculating , because
are not like terms.
Hence, can not be simplified to
Therefore, the student incorrectly simplified .
Thus, option D is correct.
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<u>Here is the correct Solution:</u>