Which method can’t you use to solve this problem? x^2 - 47 = 0 explain why

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?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no

Someone me! will award brainliest if u explain and answer!