Thank you for posting your math problem here. To convert 3.9x10^5mg to dg the answer is <span>3.9 x 10^3 dg. Below is the solution: 
Solution:
</span><span>1mg=0.01dg 
</span><span> dg= 3.9 X 10^5mg
</span>dg = <span>(3.9 X 10^5) x 0.01
dg = </span><span>3.9 x 10^3 </span>
        
                    
             
        
        
        
He paid 2 dollars for each bag. Then add 15 cents for that and he would charge $2.15 for each bag.
        
                    
             
        
        
        
Answer:- New pressure is 0.942 atm. 
Solution:- The volume of the glass bottle would remain constant here and the pressure will change with the temperature.
Pressure is directly proportional to the kelvin temperature. The equation used here is:

Where, 
 and 
 are initial and final temperatures, 
 and 
 are initial and final pressures.
 = 20.3 + 273.15 = 293.45 K
 = -2.0 + 273.15 = 271.15 K
 = 1.02 atm
  = ?
Let's plug in the values in the equation and solve it for final pressure.


 = 0.942 atm
So, the new pressure of the jar is 0.942 atm.
 
        
             
        
        
        
Answer:
See below  
Step-by-step explanation:
Ammonium lauryl sulfate has the structural formula CH₃CH₂CH₂CH₂CH₂CH₂CH₂CH₂CH₂CH₂CH₂CH₂OSO₂O⁻ NH₄⁺.
The long nonpolar hydrocarbon chain and the ionic sulfate end group make it a surfactant.  
The ionic end tends to dissolve in water, but the nonpolar chain does not. This makes the compound an excellent <em>foaming agent,</em> so it is used in many shampoos and toothpastes.
The molecules form <em>micelles</em> in water, small spherical shapes with the polar heads outside, facing the water, and the nonpolar tails are inside.
They reduce the surface tension or the water so that, when you brush your teeth or shampoo your hair, the air bubbles are stable and do not break.