Use the following figure to answer the question.
triangle abc and triangle ade share a common vertex. side de is parallel to side bc. side de measures 6 units, side bc measures 12 units, and side da measures 4.2 units.
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△abc∼△aed. what is the measure of ac? why?

Three friends went on a road trip from phoenix, az, to san diego, ca. mark drove 50 percent of the distance. jason drove 1/8 of the distance. andy drove the remainder of the distance. 1. andy thinks he drove 1/4 of the distance from phoenix, az, to san diego, ca. is andy correct? 2. the distance from phoenix, az, to san diego, ca, is 360 miles. how many miles did each person drive? 3. solve the problem. what is the answer in total?