The senior class at Jones High School and the senior class at Smith High School planned a trip to the local water park. Jones rented and filled 14 vans and 7 buses with 399 students. Smith rented and filled 1 van and 14 buses with 582 students. Each van carried the same number of students, and each bus carried the same number of students. How many students were in each van?​

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?