Answer:
x = -2
Step-by-step explanation:
 
        
             
        
        
        
Answer:
12
Step-by-step explanation:
 
        
             
        
        
        
Answer: 5
Step-by-step explanation: baddabing baddaboom
 
        
             
        
        
        
Answer: 9.70%
Step-by-step explanation:
The formula to find the percentage error is given by :-

Given : Actual mass of zinc oxide used by pharmacist = 28.35 g
 Estimated mass of zinc oxide used by pharmacist =31.1 g
Now, 
i.e. 
i.e. 
Hence, the  percentage of error on the basis of the desired quantity.= 9.70%