Given that the two right triangles are congruent, there are two possibilities.
9x - 15 is equal to the angle 33° or 9x - 15 is equal to the other angle of the first triangle.
Let's probe with the first option:
9x - 15 = 33 => 9x = 33 + 15 = 48
=> x = 48 / 9 = 5,33, which is no in the list of options.
Now, let's probe the second option.
The other angle of the first right triangle is 90° - 33° = 57°
Then, 9x - 15 = 57
=> 9x = 57 + 15 = 72
=> x = 72 / 9 = 8
Which is the option c. 8.
So, I am sure that if you have a figure it will be compatible with that answer, else yet the procedure to find the answer is what I have used here.
Answer: option c. 8
