Question

Q. Evaluate:
i. 81/3 / 42 * 40
ii. ( 0.000064 )-5/6

Answer 1

Hi Friend 
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 I) 81/3/42 x 40 
=81/3 / 1680
=27/1680 
= 9/560
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II) (0.000064)^-5/6
   = (64/1000000)^-5/6
   = (1000000/64)^5/6
   = 6th root (1000000/64)^5
   = (10/2)^5
   = 5^5
   =3125 

Answer 2

81÷3÷42×40
81×42×40÷3
27×40×42
45360