What is the value of x in the triangle? a) 289 b) 17 c) 15 d) 14.2

Hi! I don't know if I'm too late or not, but as I just answered the question on my own, I can confirm to you that the answer is:
 B) 17
At first, I thought that the length of x and 15 were equal so that's what I had chosen. It was incorrect, so taking advantage of the retry, I looked at the shape slightly closer, and noticed that angle x was slightly longer. 
 Long story short the answer is B) 17.
 If you found this helpful, please don't forget to mark me brainliest!!

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!