Elisa had some candy to give to her four children. she first took ten pieces for herself and then evenly divided the rest among her children. each child received two pieces. with how many pieces did she start.

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?