2/3 divided by 1/4 is ?

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.

He 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) 42 cm2; 27 cm2; 69 cm 2 b) 54 cm2; 27 cm2; 81 cm 2 c) 108 cm2; 27 cm2; 135 cm 2 d) 108 cm2; 13.5 cm2; 121.5 cm 2

Is a triangle with sides of length 6ft, 21 ft, 23 ft. a right triangle?