Shelly is training for a triathlon. In the triathlon she will ride her bike, run, and swim. Each week Shelly rides her bicycle 4 miles farther than the week before. Training (weeks) 1 2 3 4 5 ... 6 Riding (miles) 4 8 12 16 20 ... ? Complete the rule that relates the number of weeks Shelly has been training to the number of miles she rides. The rule is to subtract the weeks of training by . If she continues training by the same rule, how many miles will Shelly ride during her sixth week of training? She will ride miles during her sixth we