Answer:
[tex]y= 480-0.5x[/tex]
Step-by-step explanation:
Given data
Number of balls= 480
we are told that 50%(half) of the balls are put back every 1
let the number of hours be x
and let the remaining ball be y after x hours
Hence the expression is given as
[tex]y= 480-0.5x[/tex]