Homework Help: math

Posted by katrina on Wednesday, January 6, 2010 at 6:39pm.

I have no idea how to do these plaese help(:
evaluate each of the following

1. 81^-1/4 (81 to the negative power of one fourth)
2. 125^2/3
3. 64^-3/2
4. 4^3/2
answers and work please

math - Damon, Wednesday, January 6, 2010 at 6:46pm
81^-(1/4)
= 1/81^(1/4)
well 81=9*9 which is 3*3*3*3
so
3
so the answer is 1/3

125 = 5*5*5
so
125^(1/3) = 5
5^2 = 25
so the answer is 25

I bet you know 4^(1/2)
and I bet you can cube that.

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