I am stuck on this algebra question please can someone help me?

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?

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?