Answer:
9 inches.
Step-by-step explanation:
Fun question! The length of a space diagonal for a cube is
Thus, the first cube has a side diagonal of
The next cube would have a side diagonal of 3
The third cube would have a side diagonal of
And the fourth cube would have a side diagonal of 9.
Since the fifth cube has a side length equal to the side diagonal of the fourth cube, it should be 9 inches.
You need to select any numbers that are greater than 28.
If you entered the number 27 in the missing space, you would have two numbers that are equal to each other. However, we want the right side to be larger so we need to select anything larger than 27.