This problem can be represented through the following equation
A = A₀(1/2)^t/h
where
A----------->  is the amount of substance left after time t
A₀ ----------> is the original amount---------> 2 g
h------------->  is the half-life-----------> 8 days
for A=0.04 g
t=?
0.04 = 2(1/2)^t/8
0.02 = (1/2)^t/8
Take ln on both sides:
ln(0.02) = ln [(1/2)^t/8]
ln(0.02) = (t/8)(ln 1/2)
t = 8*ln(0.02)/ln(1/2)
t = 45.15 days
the answer is 45.15 days
 
        
             
        
        
        
Area of the rectangle is 2*6=12 in^2
12 could be = 1*12  or 2*6   or 3*4 
P could be 2*(1+12)=2*13=26 
                  2*(2+6)=2*8=16
                   2*(3+4)=2*7=14
the answer is 24 in  (c)
        
             
        
        
        
3(j+4)-9=9
3j + 12 -9 =9
3j +3 =9
3j =6
j=2
        
                    
             
        
        
        
Answer:
x=8
Step-by-step explanation:
44-20=24
24/4=8