How long of the sides?

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

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Find the volume of the described solid. the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x. a) 441b) 147c) 864d) 882