7th grade pre alebra help-powers and exponents?

Question

can some one give me the answers to these?

1. 5x²

2. -x² + 3

3. (-3x)²

4 6x³-20

5. 2x³

6. (4x)³

7. -6x³

Answer 1

i can im in 8th grade :) high school cridet:)

ok i think and i have not learn it yet ???? different states i think and im 2 lazy 2 think :) :( sry but email me if u got other homework help :)

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Answer 2

yeah... they really can't be simplified anymore.  what are the directions on the paper?? just to get the answer or to simplify? if that is the case then those are pretty much the answers.

Answer 3

how can there be answers if there is no value for x?

unless it's just simplifying it, like number 3 would be 9x^2

Answer 4

For the most part, they are already in simplest form..what do you want to do with them?