Kerry got the correct answer (13). Katie forgot to use PEMDAS.
Your answer is correct, all these apply here.
So, what's your question? Why do these apply?
Answer:
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Step-by-step explanation:
Answer:
Second option is correct.
Step-by-step explanation:
We have been given the expression 
We can write the term 64 as 
Thus, we have
Now, use the exponent law 
On simplifying, we get
This expression can be further simplified as
Second option is correct.
The factors that are needed to be controlled are :
1. the date of manufacturing of the drug should be the same
2. the amount of drug should be the same
3. the time they will take the drug should be the same
4. the food they are taking should be the same
5. the activities they are doing should be the same
