Okay, so a half-life means that every so and so (which in this case is 4 hours), what we have is now equal to half of that (although it does do this more gradually).
The answer to this would be 50(0.85)x
Answer:
Step-by-step explanation:

Like term are
, LCD of 3 ,6 = 6

The defining characteristic of any geometric sequence is the common ratio, which is the constant found when dividing any term by the term preceding it.
C. He showed that f(n)/(f(n-1) was a constant ratio.
Answer:
B.
Step-by-step explanation:
Since 21 is divided by 3 you might think that it is equivalent but remeber you have to divide by both sides, so if you divide 21 by 7 it works but 28 by seven does not! Hope this helps!