A certain radioactive substance decays from 100000 grams to 1000 grams in 34 days. What's it's half-life ?

Half life of the radioactive element is 5 days.

Step-by-step explanation:

Formula to get the final amount after the radioactive decay in 't' days,

Here = Initial amount

λ = Decay constant

t = duration of decay

= Final amount

0.01 =

ln(0.01) =

-4.6052 = -34λ

λ = 0.13544

Since, λ =

    = 5.11

    ≈ 5 days

Therefore, half life of the radioactive element is 5 days.

answer: 1,380

step-by-step explanation:

1: you turn %15 into a decimal by moving the decimal point two places to the left.

2: and then you multiply .15 by 1,200 , which will get you 180.00

3: from there you will add 180 to 1,200

4: which will get you 1,380

hope it *im kind of slow so idk if my answer is right*