The function f(x)=500(0.5)^x/100 models the amount of pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since material was put into the vault. find the amount of radioactive material in the vault after 140 years. round to the nearest whole number.

the amount of radioactive material in the vault after 140 years is 190 pounds.

Step-by-step explanation:

The given model for the amount of pounds of a particular radioactive material is

f(x) = 500(0.5)^(x/100)

where

Therefore,  the amount of radioactive material in the vault after 140 years will be

f(140)  = 500(0.5)^(140/100)

f(140)  = 189.5 pounds

This answer rounded off to the nearest whole number will be

f(140) = 190 pounds

Therefore, the amount of radioactive material in the vault after 140 years is 190 pounds.

step-by-step explanation:

it will be a cylinder. with a diameter of 8 and 4 single pieces high

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72