Posted by kate on Sunday, April 5, 2009 at 6:16pm.
Just use the rules for adding and subtracting exponents of the same number, when multiplying or dividing.
(4^3 x 5^-2)(5^4 x 4^-5)/ (4^-3 x 5^3)
= 4^-2 x 5^2/(4^-3 x 5^3)
= 4^1 x 5^-1 = 4/5
Do the second problem the same way
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