41. A "full" number is one that is the sum of all the other numbers besides itself by which it can be divided without leaving remainder, which of the following is a "full" number?

I. 16

II. 12

II. 28

IV. 32

A. I only
B. I and II only
C. I and III only
D. III and IV only

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?