The figure below shows a triangular wooden frame ABC. The side AD of the frame has rotted and needs to be replaced. Image

What is the length of the wood that is needed to replace AD?

A. 8.1 inches
B. 6.2 inches
C. 5.9 inches
D. 7.4 inches ​

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236