Which shows all the values of a that make the rational expression 3a^2-27/324-4a^2 undefined? a = 9
a = 3
a = –9 or a = 9
a = –3 or a = 3

On traditional maps, earth is represented in a flat plane, or by euclidean geometry. however, a globe is a more accurate model that comes from elliptical geometry. how does a globe represent the fact that there are no parallel lines in elliptical geometry? the equator is not parallel to any other latitudinal lines. the north and south poles are never connected by a geodesic. the geodesics connecting the north and south poles never intersect. the geodesics connecting the north and south poles intersect at both of the poles.

(10. in the figure, a aabc is drawn tocircumscribe a circle of radius 3 cm ,such thatthe segments bd and dc are respectively oflength 6 cm and 9 cm. find the length ofsides ab and ac.

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.