Evaluate (4x10^7)(3.6x10^-4

Question

anonymous · Answer

$$(4*10^7*3.6*10^{-4}) = 4*3.6*10^3 = 14.4*10^3 = 14400$$

anonymous · Answer

The possible multiple choice answers are 1.44x10^4, 1.44x10^2, or 1.44x10^-27

anonymous · Answer

$$14.4*10^3 = 1.44*10^4$$

anonymous · Answer

All I did was move the decimal place over one space to the left and multiply by another 10.

anonymous · Answer

$$14400.0$$
Move the decimal place over to the left 4 times.
Each time you do so, you are dividing the number by 10. So we get.
$$1.4400$$
However, to cancel this out so that we get the original number, we multiply by 10^4, because we have divided by 10^4
$$1.44*10^4$$

anonymous · Answer

The population of camden, New Jersey has been decreasing by 0.12% a year on average. If this trend continues, and the population was 79,318 in 2006, estimate Camden's population in 2015. 

Can you help me solve this?

anonymous · Answer

$$79318*(1-.0012)^{2015-2006} = 79318*(1-.0012)^{9} = about 78465$$