Is the sum of two polynomials always a polynomial

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Will give let f(x)=2x and g(x)=[tex]2^{x}[/tex] graph the functions on the same coordinate plane. what are the solutions to the equation f(x)=g(x) ? enter your answers in the boxes x=[? ] or x=[? ]

W-16=-12 solve each one step equation plz