Question

Please help me, i will give a medal and fan.




Bruce 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 54
2 27
3 13.5
4 6.75


Which function best shows the relationship between n and f(n)?

Answer 1

f(n) = 108(0.5)^n-1

f(n) = 54(0.5)^n

f(n) = 108(0.5)^n+1

f(n) = 54(0.5)^n-1

Answer 2

what do u think /.?

Answer 3

i honestly don't even know. thats why i asked for help

Answer 4

since its fixed rate , find rate of first two terms
rate=27/54=0.5

Answer 5

so f(n)=first term *( rate )^n-1

Answer 6

(0.5) right?

Answer 7

?

Answer 8

idk what I'm doing

Answer 9

use the formula of
f(n)=first term *( rate )^n-1
first term =54
rate =0.5
thn
f(n) = 54(0.5)^n-1

Answer 10

and thats it?

Answer 11

yeah !

Answer 12

oh! ok. thank you!

Answer 13

np :)

Answer 14

so what was the answer @Stormswan?

Answer 15

@xfordboy97x f(n) = 54(0.5)^n-1