Chang added some chlorine to the water in a pool. The chlorine evaporated at a fixed rate every week. The table below shows the amount of chlorine f(n), in ounces, that was left in the pool after n weeks: n f(n)
1 24
2 12
3 6
4 3

Plz help ASAP will mark brainliest
Which function best shows the relationship between n and f(n)?
f(n) = 48(0.5)n − 1
f(n) = 24(0.5)n
f(n) = 24(0.5)n − 1
f(n) = 48(0.5)n + 1