Okay so i'm struggling at this particular set of questions on khan academy. anyone got any ideas?

my best guess is 135 because if it can fit cubes with 1/4 inch sides, that means it can fit 9 cubes going lengthwise, and 3 cubes wide which is 27 cubes on the base. then it can fit 5 cubes, all 1/4 inch going up because in 1 1/4 inch there are 5 quarter inches. so if you multiply 27 by 5 you get 135. I hope that helps a little bit:)

I know this is not much help but I wrote all my work down and got 135 as well so I’m glad you got the correct answer. You will struggle sometimes, especially with challenging questions like that but remember it will always get easier as you go alone((: good luck to you!

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

5*5 is 25 because 5 plus 5 plus 5 plus 5 plus 5 is 25.

step-by-step explanation: