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 
.
Simplify: -12f – 3(2f + 2) A. 8f + 6 B. 18f – 6 C. -10f + 6 D. -18f – 6
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Let the required number is 2x ,
According to the condition,
➡ 10 times the sum of half of 2x and 6 = 8
Therefore the value of x is -5.2
And, required number is -5.2
According to the condition,
➡ 10 times the sum of half of 2x and 6 = 8
Therefore the value of x is -5.2
And, required number is -5.2