Three times Zoey's age plus Ayden's age is equal to 10. Ayden is twice Zoey's age. What is Ayden's age?

A. 2
B. 4
C. 8
D. 12

Which of the following expressions is equal to 2x^2+8

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?

Def rotates 90 clockwise about point a to create d’ e’ f’. therefore, which equation must be true ?