(15n/30n)^3
1. the n cancels out ans so you are left with (15/30)
2. 15/30 can be simplified to 1/2 and so you are left with (1/2)^3
3. (1/2)^3 is equal to 1/8 or .125
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The answer is 73.
8
That's the same as 1 divided by (x to the power 3).
94.5
(a3 + b3)/(a + b) = (a + b)*(a2 - ab + b2)/(a + b) = (a2 - ab + b2)