Her best choice would be to take a fixed rate mortgage because it would let her know exactly how much she would pay each month.
A²-b²=(a-b)(a+b)
4x² - 25= (2x)²- 5² =(2x-5)(2x+5)
You do not have this choice, so the answer is D.None of the above.
The answer is 5+0.2+0.06+0.008+0.0004
5.8/ sqrt 80=0.648 I think you are asking for the standard margin
Hope this works