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a varies inversely as b^3. If a=9/2 when b=2, find a when b is 3

 

PLEASE HELP could not solve at all

 Mar 16, 2020
 #1
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a = k/b^3      sub in a = 9/2    and b = 2   to find k

9/2 = k / 8

k = 36

 

a = 36/b^3   

   = 36/33 = 36/27 = 1  1/3

 Mar 16, 2020

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