Answer:
The answer is D: only I and II
Step-by-step explanation:
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(P+t)-7= a
7 less than the addition of the variables equals that of a
C. X= 7 only
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We have to simplify the given expression:

Dividing the terms of the numerator by the given term of denominator individually, we get
= 
By using the laws of exponent,
, we get
= 
= 
= 
= 
Therefore, the simplification of the given expression is
.
So, Option 3 is the correct answer.