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 
.
2 and 1/6 of a foot converted into inches as a fraction
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Answer:
Since the graph looks like this, I would say solid line
