Omar tried to solve an equation step by step: 3x=4.5 step 1: 3x=4.5 step 2: 3x/3 = 4.5/3 step 3: x=1.5 where is his mistake if he made a mistake at all?

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?