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losermarsh
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!!
facundo3141592

By using Pythagorean's theorem, we will see that x = 17.

How to get the value of x?

On the image, we can see a right triangle, and we want to find the measure of one of the cathetus.

Remember Pythagorean's theorem, it says that the sum of the squares of the cathetus is equal to the square of the hypotenuse.

Then we can write:

x^2 + 15^2 = √514^2

x^2 + 225 = 514

x^2 = 514 - 225

x = √(514 - 225) = 17

So the correct option is B.

If you want to learn more about right triangles, you can read:

https://brainly.com/question/2217700

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