How do I find the area under a function given the X and Y limits and equation?

Question

Precalculus f(x) = x + 4, f(x)=0, x = 2, x = 10

Answer 1

Find the domain of the composite function  f o g.

 

f(x)=           5               g(x)=     x + 5

             ---------- ,  

               x + 7

Answer 2

Since f(x) = 0, this is just the x axis, so this is the definite integral evaluated between the limits x = 2 and x = 10.

Answer 3

John, this is a precalculus question. There's no discussion or even awareness of integration nor of definite integral s at that level.