Question

I don’t understand this

Answer 1

Answer:13

Step-by-step explanation:

I assume you want to find x?

Anyways, by pythagoras, the slide length of the side that shares both triangles is sqrt(17^2 -13^2) = 2sqrt30. By Pythagoras again, x =sqrt(7^2 + (2sqrt30)^2), or 13.