In triangle $pqr,$ the side lengths are $pq = 9,$ $pr = 10,$ and $qr = 17. $ let $x$ be the intersection of the angle bisector of $\angle p$ with side $\overline{qr}$, and let $y$ be the foot of the perpendicular from $x$ to side $\overline{pr}$. Compute the length of $\overline{xy}$.

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.