X=x-9.
Subtract x from both sides of the equation
0=-9
Because this is false, there are 0 solutions.
Final answer: A
First, find out c
4c=-12, so c=-3
-5c=d, so d=15
A^2 + b^2 = c^2
a^2 + 9^2 = 18^2
a^2 + 81 = 324
a^2 = 243
a = 15.589 = 15.6 feet is the angle the ladder is at :)
guys where is the question