HA2- End Behavior Review

What is the end behavior of:

 $6x^2-8x^4+2x-6x^4$  

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What is the end behavior of:  $3x\left(x^4+7x\right)$  

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What is the end behavior of:  $\left(7x+3x^3-2\right)-\left(8x^3+3x+5\right)$  

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What is the end behavior of: 

 $6x^4-6x^6+6x^8$  

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What is the end behavior of: 

 $x^8\cdot5x^3$  

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What is the end behavior of: 

 $12x^5+7x-13x^5+1x-8x^6$  

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What is the end behavior of: 

 $\left(-8x^2\right)^2$  

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