What is the probability of rolling a number less than or equal to 8 with the sum of two dice, given that at least one of the dice must show a 6? a. 9/11 b. 4/11 c. 2/11 d. 7/11

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?