I went to the store and bought a pair of boots and a jacket and my total was $125. The price of the jacket is $15 more than triple the price of the boots. How much do the boots cost?

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?