The answer you would be looking for is C. This is because both angles together form a right angle, making them complimentary!
The reason why it is not B as the other person answered is because supplementary makes 180 degrees. When that is not the correct answer to this question.
When solving the equation, you first have h- 9/5. So it would by x=(h - 9/5). But you are not done yet. you still have to divide it by R to get x. So the final equation is x=(h - 9/5) ÷ R
