(120x)^1/2 see attached photo for steps
400,000+90,000+2,000+0+30+02=492,032 is the answer put that and you will get a good grade :)
Answer: 4 years
Step-by-step explanation:
A(0) has to be amount at start. Assume that's 5mg
Then A(t) = 5×(0.5)^(0.25t) = 5×2^(-t/4),
(also known as 5 exp(-λ t) with λ = ln(2)/4, incidentally).
We need to such that A(t) = 2.5mg, or 2^(-t/4) is 1/2, which happens when -t/4 is -1, or t is 4.
Answer:
B
Step-by-step explanation:
The other answers don't divide into rational numbers