Me with this geometry question (100% correct only)

This is easy.  You basically round them all up. So 1.8 would turn into 2, 2.9 would turn into 3, and 5.7 would turn into 6.  So now you have 2, 3, and 6.  Now to calculate volume, you multiply length time width times height.  So you multiply 2x3x6, and your answer is

36ft³

Hope this helps! :)