Anyone out there knows the answer?

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

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?