Suppose triangle CDF, whose vertices have coordinates C(-2, 1), D(4, 5), and F(5, 3), is reflected over the x-axis. Part A

Explain a way to determine the coordinates of the vertices of triangle C'D'F' (15 pts).

Part B

Find the coordinates of triangle C'D'F' (10 pts).

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”?