In the triangle, what is sin 45°? Give your answer in the simplest radical form. Rationalize the denominator if necessary. Watch this video to review trigonometric ratios.

Which of the following statement about pascal's triangle are true?

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?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15