At the zoo, the ratio of dolphins to penguins is 2:5. If there 30 penguins, how many dolphins are there?

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

Factor the following expression completely 6x^11-24x^7

The trapezoid is composed of a rectangle and two triangles. what is the area of the rectangle? what is the total area of the triangles? what is the area of the trapezoid? a) 48 cm2; 32 cm2; 80 cm 2 b) 48 cm2; 16 cm2; 64 cm 2 c) 128 cm2; 32 cm2; 160 cm 2 d) 128 cm2; 16 cm2; 144 cm 2