Which values of X, when substituted into the function Y= X-4/2X^2+8X would make it undefined 

Acircle has the equation (x-2)^2 +y^2 =5. what are the coordinates of the circle's center?

Icould really use some with this question.

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !