(126) times (1/2 to the x/11 power) = 15% times 126
(1/2) to the x/11 power = 0.15
Take the log of both sides :
(x/11) times log(1/2) = log(0.15)
Multiply both sides by 11 :
'x' times log(1/2) = 11 x log(0.15)
Divide both sides by " log(1/2) " :
x = 11 x log(0.15)/log(1/2) = <em><u>30.107 years</u></em> (rounded) 
That's the time it takes for <em><u>any-size</u></em> sample of this substance
to decay to 15% of its original size.
        
             
        
        
        
Answer:
Step-by-step explanation:
4/18×2/92
=1/9×1/23
=1/207
1/9×3/63
=1/3×1/23
=1/69
12/14×1/84
=1/14×1/7
=1/98
1/7×5/65
=1/7×1/13
=1/91
17/20×1/61
=17/1220
4 1/4 ×3 1/22
=17/4×67/22
=1,139/88
=12 83/88
3 5/6×4 1/23
=23/6×93/23
=93/6
=15 3/6
=15 1/2
2 1/2×4 7/84
=5/2×343/84
=1715/168
=10 35/168
 I have answered more than 2 from each set
 
        
             
        
        
        
Answer:
i think it is 3
Step-by-step explanation:
 
        
                    
             
        
        
        

Keep in mind: The entire line segment (VX) is equal to 14.

Let's see how the line segment looks like first.
Line segment VX is 14 units long.
              14
 ______________
 V                         X
W is on the line segment somewhere, and VW is equal to 3. 
      3              ? 
 ______________
 V           W           X

We have to solve for the <em>?.</em> Let's put ? as x. So now we are solving for x.
We have to set up our equation like this:
x + 3 = 14
Since our unknown value plus 3 is equal to 14, we have to subtract 3 from 14 to get our answer.
14 - 3 = 11
    3               11 
 ______________
 V           W           X
