The Average Student Enrolled in the 20-Week Court Reporting I

Multiple Choice

The average student enrolled in the 20-week Court Reporting I course at the American Institute of Court Reporting progresses according to the rule ​ ; ​
Where measures the rate of change in the number of words/minute of dictation the student takes in machine shorthand after weeks in the course. Assuming that the average student enrolled in this course begins with a dictation speed of 61 words/minute, find an expression that gives the dictation speed of the student after weeks in the course.
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