Anthony is preparing to run a marathon in 15 weeks. he increases the amount of miles ran each week according to the chart below. if he follows the same pattern each week, how many miles will he run in the 15th week? weeks (x): 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | miles (y): 1 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | a: 22 miles b: 29 miles c: 30 miles d: 31 miles