1. A population of bacteria doubles every 12 hours. Initially, the population of bacteria is 80.
What is the population of the bacteria after 30 hours?
We have the following
80 (2) t/12 ....so.......when t = 30....we have
80 (2) 30/12 ≈ 453
2. What type of exponential function is f(x)=0.75(2.1)x
In the form
f(x) = a* bx if b > 1 we have a growth function as x increases
So......This is a growth function......the rate of change is 2.10 * 100 = 210 %
3. Just put 4 into the function
(4)^4−2(4)^3+5(4)^2−20(4)−4 =
256 - 128 + 80 - 80 - 4 =
124