david is ordering a photo book for his mom. The cost for a 7" x 9" book with 10 pages is 20$. Each additional page costs $1.50

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?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

I'm confused on this could anyone me and show me what i need to do to solve it.