Shadow
posted by Shadow .
Write an equation to solve each problem.
The sides of one cube are twice as long as the sides of a second cube. What is the side length of each cube if the total volume of the cubes is 72 cm^3?
Would it be, 3x+6x=72? Thanks

Shadow 
bobpursley
No. It wouldn't be that.
volumes of cubes is V=s^3 where s is side length.
72= s^3+ (2s)^3= s^3+8s^3
72=9s^3
and you find s, the side length of the smaller cube, and 2s is the side length of the larger cube. 
Shadow 
Shadow
I came up with 8=s^3, how would I solve this? Thanks

Shadow 
bobpursley
Take the cube root of each side.

Shadow 
Shadow
Thanks for your help!
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