Which equation is a linear equation? Bw- Dx2 + y2 = 0 3 A 4m2 = 6 xy -y=D0 C 3a + 5b = 3

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?