(f+g)(x)=f(x)+g(x)=(2x-6)+(4x+7)=6x+1
(f-g)(x)=f(x)-g(x)=(2x-6)-(4x+7)=-2x-13
(fg)(x)=f(x)×g(x)=(2x-6)(4x+7)=8x^2-10x-42
(f+g)(-2)=f(-2)+g(-2)=(2(-2)-6)+(4(-2)+7)=-11
21/25 is already a fraction and if you wanted it to be simplified, its already simplified to be 21/25.

the equation is the horizontal line which parts through (-5,6), since it has no slope.
X=4 it is a vertical line
Step-by-step explanation: You can't continue on with the problem until the denominators are the same. So you need to find the LCD (Least Common Denominator). For example...
The LCD is six



Hope this helps, have a BLESSED and wonderful day! :-)
-Cutiepatutie <3