Determine the equation of the ellipse with center at the origin, one focus at (-12,0) and length of the semi-major axis of 13.

On saturday a souvenir shop had 125 customers. sixty four percent of the costumers paid with a credit card. how many costumers paid with cash?

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?

Which of the following expressions cannot be simplified to x – 2?