book Maths Puzzle Numerical Ability

how do i factor 9x-3y+6?

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Hi. Here is a problem I am having trouble with:

Two cubes have sides of lengths 4 cm and 6 cm, respectively. What is the ratio of their volume?

Thanks for your help! If n x 3.82 is about 120, what is a reasonable estimate for n?
(I am just starting on algebra, and need to see if I am doing this right, thank you)