The population starts at 2000, so a=2000.
We also know that the population in 3 hours is 1000, so we can setup the equation:
2000 b^3 = 1000
This gets us:
b^3 = 1/2
And taking the cube root of both sides gives us:
b ≈ 0.7937005259841
Rounding that to 4 places, we have:
f(t) = 2000 (0.7937)^t
You need to use the distributive property. So you take the -9 from outside the parentheses and multiply itself by the numbers inside.
The answer are B, D and F.
If you solve for x for B, D and F, you'll get (1/2,5)
