On the initial day of class (i.e. N=0 ), a professor counts 690 students as being present in her math class. On the 6^th day of class (i.e. N=5 ) the professor counts 450 students as being present in her math class. If the number of students decreases in a linear fashion, what is the common difference d ? A) -6 B) -18 C) -36 D) -48 E) None of the above.

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The Answer of On the initial day of class (i.e. N=0 ), a professor counts 690 students as being present in her math class. On the 6^th day of class (i.e. N=5 ) the professor counts 450 students as being present in her math class. If the number of students decreases in a linear fashion, what is the common difference d ? A) -6 B) -18 C) -36 D) -48 E) None of the above.

On the Initial Day of Class (I