A softball backstop that is 10 feet high casts an 8-foot shadow at the same time a light pole casts a 20-foot shadow. The height of the flagpole is about how many feet??

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?

Extra points! find the missing dimension! need asap

Hurry which expression is equivalent to 3√x^5y?