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2 years ago

How to simplify (81^-0.25)^3

1 answer:

4 0

(81^-0.25)^3 = ( 1 / (81^0.25) )^3

81^.025 is the 4th root of 81 which is 3 
Therefor 
( 1 / (81^0.25) )^3 = (1/3)^3 

(1/3)^3 = 1/27 <-----

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$y+2z+5(20-y-z)=55\\\\\Rightarrow -4y-3z=-45\\\\\Rightarrow y=\dfrac{45-3z}{4}~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(v)$

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