If someone could assist me with this i would be extremely thankful

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

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?

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20