Which of the following has no solution?
a. {x | x ≤ 1} and {x | x ≥ 1}
b. {x | x < 1} and {x | x > 1}
c. {x | x ≤ 1} or {x | x ≥ 1}

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?

Fast! find the length of cu. the triangles are similar. show your work.

What are the excluded values? m+5/mn+3m