Answer:

Step-by-step explanation:
Given the exponential decay function 
When
then

so the initial amount is 
The exponential decay function
has the decay factor 
In your case, the eexponential decay factor is 
Answer:
$210
Step-by-step explanation:
9.50*4= 38
5*2=10*4=40
3*4= 12
4*4= 16
26*4= +104
---------
210
The answer would be (B/A)*100%
Answer: 21
Step-by-step explanation: Just plug in the numbers for x, and you get 21 when you plug that in.