Help ;-; please I cannot remember how to do this my memory is screwed up

What does x = in this equation x+3+2x=x+5

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.