http://s22.postimg.org/6q6l7kqw1/image.jpg Can someone explain these? I dont rly understand when its sum (i do when i need to multiply )

Question

benlindquist · Answer

ur guesses

anonymous · Answer

Um for example 81:   2^3/6 + 2^1/2?.. But what next?

vickyisthesmartone123 · Answer

Hmmmmm.....(im thinking)

anonymous · Answer

8^(1/6) + 2^(1/2)
8^(1/3)*(1/2) + 2^(1/2)
2^(1/2) + 2^(1/2)

2^(1/2) = square root of 2

In other words, 

Square root of 2 plus square root of 2 is 2 times square root of 2

anonymous · Answer

= (2^(3^3)^1/4) ^ 3^(1/4)
= (2^(3^3/4) ^ 3^(1/4)
= (2)^3
= 8

anonymous · Answer

C. Is equal to 2 but I want you to work it out yourself

anonymous · Answer

Sorry I meant 82