Can you type it out the picture is too blurry to read, sorry. 
        
             
        
        
        
M=43lb = 19,5kg
If 115mg --------- is for --------- 1kg
                             so
    x        ---------- is for --------- 19,5kg
x = 19,5kg * 115mg / 1kg
x = 2242,5 mg
        
                    
             
        
        
        
Answer:
time taken to cook on the pressure cooker = 100 seconds = 1.67 mins
Explanation:
 
        
             
        
        
        
I believe you are referring zero as the exponent. <span>Any number (except 0) with exponent 0 is defined to mean 1.
</span>
For one thing, there is a rule: 
<span> a^m/ a^m = a^m-m = a^0
</span>But (when a is not equal to <span>0),
</span>
a^m/ a^m = 1
Therefore, we must define a^0 as 1.