Find the area of the circle

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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?