Andrew would like to put six different Rubik's cubes onto three shelves. a
In how many ways can Andrew do this?
b
In how many ways can Andrew do this, if each shelf must have at least one Rubik's cube?

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

An ant travels at a constant rate of 30cm every 2 minutes. at what speed does the ant travel per minute