In training for a marathon, an athlete runs 7500 meters on the first day, 8000 meters the next day, 8500 meters the third day, each day running 500 meters more than on the previous day. How far will the athlete have run in all at the end of thirty days?
Use: Sn = n/2(2a1 + (n – 1)d)
S30 = 30/2(27500 + (30 – 1)500)
S30 = 442,500m or 442.5 km