Find each of the following products by drawing and labeling a generic rectangle or by using the distributive property
a. -4y (5x + 8y)
b. 9x (-4 + 10y)
c. (x^2 -2)(x^2 + 3x + 5)

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?