PLEASE HELP 10 POINTS

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

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?