Midge 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 16
2 8
3 4
4 2

Which function best shows the relationship between n and f(n)?
f(n) = 16(0.5)n-1

f(n) = 32(0.5)n-1

f(n) = 16(0.5)n

f(n) = 32(0.5)n+1

Question

Midge 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	16
2	8
3	4
4	2


Which function best shows the relationship between n and f(n)?
 f(n) = 16(0.5)n-1

 f(n) = 32(0.5)n-1

 f(n) = 16(0.5)n

 f(n) = 32(0.5)n+1

anonymous · Answer

Hey @Boblovesmath think you can help me with this?

anonymous · Answer

A good way to solve this one is to plug in the value of n and see if it gives you the desired point.

anonymous · Answer

you have the points (1,16), (2,8), (3,4) and (4,2)

anonymous · Answer

so when you plug in 1, you should get 16.

anonymous · Answer

See which equation satisfies all of the points.

anonymous · Answer

OK, thanks @Boblovesmath

anonymous · Answer

you welcome

anonymous · Answer

@Boblovesmath so its b?

anonymous · Answer

No, it is C because you only get 16. So, you should cancel out B and D. Ok? Now, the answers that you are left with A and C. Which one do you think it is? I think it is C.