The amount of a radioactive material changes with time. the table below shows the amount of radioactive material f(t) left after time t: t(hours) 0 1 2 f(t) 180 90 45 which exponential function best represents the relationship between f(t) and t?

Step-by-step explanation:

The general exponential function is written as :-

,where y is the amount of the material after t years , A is the initial amount and b is the multiplicative rate of growth or decay.

From the given table , f(0)=180

Thus the  initial value of radioactive material  =180

Also, the decay factor is the ratio of the consecutive terms :

Now, put A = 180 and b =0.5 in (i), we get

Therefore, the exponential function best represents the relationship between f(t) and t is

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6