Only need help on 27 please help asap!

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

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?

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction