A cube has an edge lenght of 9 centimeters.
If the side length is increased by a factor of 3, how much larger is the perimeter of a face of the new cube?
A 72cm
B 72cm^2
C 108cm
D 108cm^2

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?