The point D transformed into S The point E transformed into R The point F transformed into U
The lengths are angles didn't change as result of the transformations (rotation and translation do not change the shape nor dimensions). Then, the resulting triangle is congruent to the original triangle.
Using the same order for the letters, you might say that ΔDEF ≅ ΔSRU
$18. You get this because you subtract 7 from 16 since that’s money he got. You get 9. Since Jack spent half his allowance money, you double the money he had left after spending it, giving you $18.