Answer:
Part A) The length of rectangle is 
Part B) The perimeter of the square is 
Part C) 
Part D) 
Step-by-step explanation:
Part A) Find the length of the rectangle
we know that
The perimeter of rectangle is equal to

we have


substitute and solve for L



Part B) Find the perimeter of the square
we know that
The perimeter of a square is

we have that

substitute the value of L

Find the perimeter of the square

Part C) Find how many cm greater the rectangle's perimeter than the square's perimeter if x=4
<u>Find the value of rectangle's perimeter</u>
------> 
<u>Find the value of square's perimeter</u>
------> 
<u>Find the difference</u>

Part D) Find how many square cm greater the rectangle's area is than the square's area if x=4
<u>Find the value of rectangle's area</u>
------> 
<u>Find the value of square's area</u>
------> 
<u>Find the difference</u>
