The Data Entry Speed (In Words Per Minute) of a Data

The data entry speed (in words per minute) of a data clerk trainee is , where x is the number of hours of training he has had. What is the rate at which his speed is changing and what does this rate mean when he has had 15 hours of training? ​

A) If the training hours are increased from 15 to 16 hours, the student's typing speed will increase about 5.00 words per minute.
B) If the training hours are increased from 15 to 16 hours, the student's typing speed will increase about 12.50 words per minute.
C) If the training hours are increased from 15 to 16 hours, the student's typing speed will increase about 6.25 words per minute.
D) If the training hours are increased from 15 to 16 hours, the student's typing speed will decrease about 5.00 words per minute.
E) If the training hours are increased from 15 to 16 hours, the student's typing speed will decrease about 2.18 words per minute.

Correct Answer:

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