Answer:
See Explanation
Step-by-step explanation:
The question is incomplete, as there are no options to select from.
However, a general explanation is as follows.
Given

Required
Is
a correct expression?
Let


So:

becomes


Divide both sides by 2

Hence:
is incorrect
Assuming that the numbers haven't been rounded off, then yes, they are the same.
Answer:
20
Step-by-step explanation:
a5
4*5
20