Answer the following questions based on the graphic and information given below. In the figure below, a surveyor put stakes at the lettered points. He used string to determine lengths of line segments and a transit to check that the angles at D and B were both right angles.

If CD = 3, CE = 5, DE = 4 and DB = 18, and:

AB =
units.

ANY IRELEVANT ANSWERS WILL BE FLAGGED