The diagram shows the universal set U = {parallelograms}.

Set A represents parallelograms with four congruent sides, while B represents parallelograms with four congruent angles.

How many of the parallelograms fall into the category A U B?

(The picture of the diagram is provided.)

A. 6
B. 8
C. 18
D. 26

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”?