What point represents the center of a circle whose equation is (x-3)^2+(y-6)^2=64

Which of the following tables represents exponential functions?

Is this a polynomial function? i need to know asap

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?