Answer:
-15
Step-by-step explanation:
I think c is the answer but plz make me a brainlist plZ plZ plZ plZ plZ always help you
The Answer is D. It is the x-values.
Answer:

Step-by-step explanation:
We see that this is a rectangle triangle, and that the ZY side is the hypotenuse.
It's length is then square root of the sum of the squares of the other sides:

So, in this case:

The 8 and 3 numbers are easy to get from the graphic... and the order doesn't matter (8² + 3² = 3² + 8²).
That's an easy rule to remember.
I hope it helps.