9. The diagonal BD divides quadrilateral ABCD into a right triangle and an equilateral triangle, as shown
below. The given dimensions are in centimeters. How
many centimeters long is AD ?
A. V14
В.
B. 7
10
8
D. 14
E. 28
C 6 D

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%