Respuesta :

mathstudent55

Answer:

B. 9.9 ft

Step-by-step explanation:

You have a right triangle, so you can use the Pythagorean theorem.

a^2 + b^2 = c^2

15^ + x^2 = 18^2

225 + x^2 = 324

x^2 = 99

x = sqrt(99)

x = 9.9

Answer: B. 9.9 ft