Answer:
Therefore Perimeter of a Square,
1. 
2. 
Step-by-step explanation:
Given:
The measure of one side of a square is (s + 3) inches long,
∴ length of a side of square is (s+3) inches
Let the Perimeter of a Square be "P"
To Find:
P =?
Solution:
Square:
For a Square all sides are EQUAL.
Perimeter of Square:
Sum of all the sides.
It's Formula is given by,

side = length of a side of square
Substituting the values we get
Applying Distributive Property A(B+C)=AB+AC we get
Both the Expression is Equivalent
Also you can get it by adding sides 4 times ,

Therefore Perimeter of a Square,
1. 
2. 