If line M is parallel to line N, which angle is supplementary with 1? A.

2

B.

3

C.

6

D.

all of the above

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”?