AABC is dilated by a factor of to produce AA'B'C' What is AC, the length of AC after the dilation? What is the measure of ZA?
A. A'C' = 60, m2A'= 28°
B. A'C' = 15, m2A'= 28°
C. A'C'= 15, m2A'= 14°
D. A'C'= 17 m2 A'= 62°

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”?