Mrs. Proud's van was purchased new for $26,500. It is known that her model of van depreciates year. Write the exponential equation then state when the van will be worth exactly $4,000

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?