Which graph represents a proportional relationship

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Need plz been trying to do it for a long time and still haven’t succeeded

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.