Question

An element with a mass of 990 grams decays by 16.9% per minute. To the nearest

minute, how long will it be until there are 80 grams of the element remaining?

Answer 1

14

Explanation:

Answer 2

It will take 13.58 minutes until there are 80 grams of the element remaining

Explanation:

An element with a mass of 990 grams decays by 16.9% per minute.

We are supposed to find how long will it be until there are 80 grams of the element remaining

Formula :
`N(t)=N_0(1-r)^t`

N(t)=Amount after t minutes

`N_0`=Initial amount

r = rate of decrease = 0.169

t = time in minutes

Substitute the values in the formula :

`80=990(1-0.169)^t`

`(80)/(990)=0.831^t`

t=13.58

Hence It will take 13.58 minutes until there are 80 grams of the element remaining