first answer gets brainliast. Don't need too much explanation thank you!

The answer to your question is below

Step-by-step explanation:

2.                Just find the prime factors of 128 and simplify

3.-     Get the square roots and simplify

     3i + 4i

     7i

4.- None of the choices is equal to one, because the exponents are pair.

5.- 1/3x² + 10 = 7

    1/3x² = 7 - 10

    1/3x² = -3

         x² = -3(3)

         x² = -9

         x = ±3i

126 maybe. sorry