First one to answer will be marked brainliest

c, b, d

Step-by-step explanation:

4. 9^6 is the same thing as multiplying 6 9's, which is option C.

5. Since they have the same base, we can subtract the exponents to get 4^6, or option B.

6. When you have a^(-m), you write it as 1/a^m. In this case, we have 1/(2/3)^3 =  1/(8/27) = 27/8, which is option D. Hope this helps!

12m

step-by-step explanation:

square root means have of a number so have of 3 is 1.5 then multiply it by 8 and you get your answer!