What is the surface area of a cylinder with base radius 4 and height 7?

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?

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

Which expression is equivalent to -5(3x - 6/7)