Idon't understand how to do it can someone me !

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Arestaurant gives out a scratch-off card to every customer. the probability that a customer will win a prize from a scratch-off card is 25%. design and conduct a simulation using random numbers to find the experimental probability that a customer will need more than 3 cards in order to win a prize. justify the model for your simulation, and conduct at least 10 trials.

15/16 as a decimal rounded to the nearest hundredth