Which is equivalent to (9 y squared minus 4 x)(9 y squared + 4 x), and what type of special product is it? 81 y Superscript 4 Baseline minus 16 x squared, a perfect square trinomial
81 y Superscript 4 Baseline minus 16 x squared, the difference of squares
81 y Superscript 4 Baseline minus 72 x y squared minus 16 x squared, a perfect square trinomial
81 y Superscript 4 Baseline minus 72 x y squared minus 16 x squared, the difference of squares

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

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.

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.