To find the distance across a river, a surveyor chooses points A and B, which are x = 450 ft apart on one side of the river (see the figure). She then chooses a reference point on the opposite side of the river and finds that LBAC 82° and LABC
52º. Approximate the distance from A to C. (Round your answer to the nearest foot.)
X ft
A xft
B
82° 520
का
C с

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?