The height of each story in a hotel is feet. The height is measured from the ceiling to the floor. The hotel has 2 underground levels that are used as banquet halls. Stephen is a waiter who works two levels below the ground. At what elevation are Stephen’s feet? Assume the ground level of the hotel is at 0 feet.

-2x

X being how tall each level is

If you don't have that information it would just be

-2  

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.