Write an equation for the following transformation of y=x : a vertical stretch by a factor of 4

Which expression is equivalent to the expression shown?

Abag of jelly beans contain 13 pink, green, 20 yellow, 10 black, 7 red, and 11 orange jelly beans. approximately what percent of the jelly beans are pink and yellow?

If the discriminant if a quadratic equation is 4 which statement describes the roots?