The answer is D. This is because you multiply the multiples. Plz listen to me. So, first multiply the numbers that are first in the parentheses. These numbers are -4 and 3. A negative times a positive is always negative. This is -12. Then multiply 10 to the power of three by 10 to the power of six, which is 10 to the power of nine. A lot of words right?
This is much easier to solve if you draw it out on a graph. The perimeter is the sum of all the sides. I used the Pythagorean theorem to find the hypotenuse.