This is a square with area 36 in^2
So dimensions are 6 * 6 ins and perimeter = 24 ins.
the number 2 is a factor of all even numbers (b)
Find Total weight at left side

Now
Per block weight at right side

Answer is C, just multiply and expand.
Answer:

Step-by-step explanation:
Move
to the denominator in 
using the negative exponent rule 