Identifify all of the following four operations that are NOT closed over the set of all positive real numbers: addition; subtraction; multiplication; division.

Answer: 2

Bonus

Math - Multiple ChoiceWhich of the following ratios represents the ratio of the diagonal of a cube to a diagonal of one of the faces of cube?

W) 2 to the square root of 3

X) the square root of 3 to the square root of 2

Y) the square root of 3 to 1

Z) the square root of 6 to the square root of 3
X) THE SQUARE ROOT OF 3 TO THE SQUARE ROOT OF 2