Does anyone know about this

11.0

Step-by-step explanation:

Using Pythagoras' identity in the lower right triangle.

let the hypotenuse be x , then

x² = 4² + 9² = 16 + 81 = 97

Within the rectangle, use Pythagoras' identity in the lower right triangle.

let y be the dotted line , then

y² = x² + 5² = 97 + 25 = 122 ( take the square root of both sides )

y = ≈ 11.0 ( to the nearest tenth )

The dotted line is approximately 11.0 units

step-by-step explanation:

mean or average is 40.6