Need answers now 3 added to 1/4 a number give 7 what is the equation

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

If the value of cos330°is√3/2 then find cos 165°.

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.