Solve for the variable x - 9 = 11

Aline that intersects one of two parallel lines intersects the other also always sometimes never

Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g