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%
Answer:
nigгer
Step-by-step explanation:
nigгer
Answer: B. False
Step-by-step explanation:
You assume the inverse of what you intend to prove is true, not the converse.
No, it does not always have to be a decimal although it is more common to have one.