I need the answer because i’ve got like 10 other essays and assessments

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

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?

Solve the system of equations y= 3/2 - 1, -x+ y =-3