What is factor by GCF

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

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?