Anyone know which one is the right one

1) the square root of 64=8

2) The square root of a^4=a^2

3) b^5=b√b

so the first amount simplifies to 8a²b²√b

4) ∛64=4, as 4×4×4=64

5) ∛a^5=a√a²

6)∛b^4=b√b

so...the second amount is equal to 4ab∛a²b

The last one should be correct

Hope this helped :)

my guess would be b and d, but i didn’t actually get out the pen and paper. lol

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x