okay me again 10 points second round of math easy radicals alg2?

Question

6. Evaulate 18/9^3/2

7. (√-8)(√5)

8. 6 + i / -4i

9. 2-3i/5 +2i

10. x+32 = 0

Answer 1

6.) 2^1.5 or
2.8284271247461900976033774484194 (???)

7.) = √40

8.) 6+1/4i

9.) 2(8i/5)

10.) x=32

I hope!