if your key 4 was broken and you had to find six ways to make 40 what's 6 Ways to make 40 Without using 4
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Step-by-step explanation:
I think that the photo below has full information for your question and the answer for it as well.
Hope it will help you!
To model half-life, use the formula 
. Here, 
is the amount remaining after a length of time 
. 
is the amount that you start with. 
is the half-life. You plug in 50 for , 10 for , and 25 for . You get 
.