Which expression is equivalent to (1/√y)^-1/5

Which number line correctly shows 0.8 + 0.3?

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.

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