Question 295313
Can you please help me understand this problem? 
Evaluate: 
xy^-2/3 for x=2 y=8
Sub 2 for x and 8 for y
= {{{2*(8^(-2/3))}}}
2 is the cube root of 8
= {{{2*2^(-2)}}}
= {{{2/2^2}}}
= 2/4
= 1/2
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