Question 1193254
Exponential Decay Function: {{{y=a*(1-b)^x}}} where

"a" is the original amount
"x" is the time
"b" is the percent change in decimal form per unit of time

{{{y=500*(1-0.01)^104=175.805}}}
or 175 small fuzzy animals would be left after the 104th week.
(you don't round up to 176 unless 0.805 of an animal would still be alive!)
(also, none would be left after the 619th week)

Here is a graph of the function using Desmos.com
https://www.desmos.com/calculator/odknz9ms6t

Math check:
{{{175=500*(1-0.01)^x=104.456}}} which is the number of weeks