13 is the answer for ur question
Answer:

Step-by-step explanation:
Given

Required
Factor

Factor out 

<em>The expression cannot be further factored</em>
A^2-b^2=(a+b)(a-b)
1: x^2-4=(x+2)(x-2)
2: (x+8)(x-8)
3: (x+10)(x-10)
4: (x+14)(x-14)
A radioactive atmosphere around the area and an expensive, hard time cleaning everything up.