How do i find the ratio of two numbers

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.

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

In the diagram, gef and hef are congruent. what is the value of x