100 would be correct because the 9 in the hundredths place rounds to a ten, and so does every other number.
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:
141.4
Step-by-step explanation:
i think
Answer:
y = 4x + 5
Step-by-step explanation: