Correct Answer: A. 2(n+8).
Answer:

Step-by-step explanation:
Given


Required
Find x such that: 
This gives:

Collect like terms


Expand

Factorize

Factor out x - 1

Solve:

Answer:
1.3 repeating
Step-by-step explanation:
Every square is a rectangle because it is a quadrilateral with all four right angle (a rectangle is not a square)