Alaska, hawaii, washington have active volcanoes. alaska has 43,hawaii has 5,and washington has v. if hey have 52 active volcanoes in all, how many volcanoes does washington have?

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?