Will mark brainiest my teacher says everything is there to answer this question but i don't know. someone explain. two travellers spend from 12 o'clock to 6 o'clock walking along a level road, up a hill and back again. their pace is 4 mph on the level, 3 mph uphill, and 6 mph downhill. how far do they walk and at what time do they reach the top of the hill?

The biologist has a second culture to examine. she knows that the population of the culture doubles every 15 minutes. after 1 hour and 15 minutes, her assistant found that 80,000 bacteria were present. a) what was the size of the initial population? b) predict the size of the culture at t=3 hours. what was the size of the population at 40 minutes? explain and justify your answers. c) create a graph of the population as a function of time. find an equation that can be used to predict the size of the population at any time t. d) examine the rate at which the bacteria culture is growing. how fast is the culture growing after 1 hour? after 1.5 hours? after 2 hours? use a time interval of h = 0.01 hours to estimate these rates. interpret these rates in terms of the context of the problem situation. how do these three rates compare?