Cobalt-60 has an annual decay rate of about 13%. how many grams of a 300 g sample will remain after 20 years? round the answer to two decimal places. a. 0.06 g b. 9.38 g c. 18.51 g d. 37.50 g

Option: C is the correct answer.

                          C. 18.51 g

The situation of this problem can be modeled with the help of the exponential decay function :

i.e. any component if it has a initial amount as a units and is decaying at a rate of r% then the amount after t years is given by:

Here we have:

r=13%

and a=300 g

and t=20 years

Hence, we have

The amount that will be left after 20 years is:  18.51 g

answer: 4 meters

step-by-step explanation: to you understand 2/3 better you can do 1 divided by 3 = . then multiply that by the 2 which is .66666666666666667 then you would do 6 x .66666666666666667 which is 4.      

hope this .