Help me please need help

(if f(x)=4x^2 and g(x)=x+1, find (f o 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?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?