If the pendulum is 8 feet long, how long will it take for the pendulum to complete a full cycle

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?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

How many square inches are in 60 square feet?