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What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

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.

Which of the following is true for the relation f(x)=2x^2+1