a salvage ships sonar located wreckage at a 15° angle of depression. A diver is lowered 59 meters to the ocean floor. how far does the diver need to walk along the ocean floor to the wreckage?

What is the number 321,000,000 in scientific notation? also what is the number? ?

Sum is 17 and their difference is 3

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?