Please answer quickly, and nO FiLesS PLEAsEeEeE

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Asap! i'm not good math and i'm lost.

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?