Atourist attraction provides a guide for every group of 15 visitors. one saturday, the owner uses the equation 15 × 8 = 120 to find the number of visitors that received a guided tour. what does the 8 in the equation represent?
the number of visitors that received a guided tour that day
the number of visitors in each guided tour
the number of groups that received a guided tour that day
the number of groups that received a tour over 8 days

Ascientist places 24 cells in a petri dish. she knows the cells grow at an exponential rate, doubling in number every hour. how long will it take (in hours) for there to be 1100 cells in the dish? time to 1100 cells: 5.51832530 hours how long will it take to reach 110 cells? time to 110 cells : 2.1963972 hours what is the average rate of change in the number of cells between 9 hours and 11 hours? average rate of change: cells per hour what is the instantaneous rate of change after 7 hours? instantaneous rate of change: cells per hour note: you can earn partial credit on this problem.