Tracy had 87 nickels. she used some of her nickels to buy a cookie. tracy later found 19 nickels in her backpack. now tracy has 64 nickels. how many nickels did tracy use to buy the cookie?

In the picture below, line pq is parallel to line rs, and the lines are cut by a transversal, line tu. the transversal is not perpendicular to the parallel lines. note: figure is not drawn to scale. which of the following are congruent angles?