I need help with this worksheets

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

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.

How would you describe the difference between the graphs of f(x) = 2x2 and g(x) = -2x2?