What is this called, like whats the name of this thing??
{18 ≤ y ≤ 30}

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?

Bring the fraction a/a-4 to a denominator of 16-a^2

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319