Which of the line segments shown in the coordinate plane are congruent? A(-2, 3) B(5, 7) C (3, -3) D (-3,-5) E (-3, 10)

00

00

-10 8 6 4 2

2 4 6 8 10

8

69

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”?