Which sequences are arithmetic? Check all that apply. 0, 10, 20, 30, . . .
3, 5, 7, 9, . . .
4, 8, 16, 32, . . .
8, 11, 13, 16, . . .
13, 29, 45, 61, . . .

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?